Openssl check certificate revocation status Determine the URL of the Online Certificate Status Protocol (OCSP) The Online Certificate Status Protocol (OCSP) was created as an alternative to certificate revocation lists (CRLs). Since it will only be used for testing I assume that the minimal implementation provided by OpenSSL should suffice. I have an embedded C client program that securely connects to a server using OpenSSL. Its file-based, runs on RHEL, uses "serial" and "index. pem file). Introduction Online Certificate Status Protocol Stapling, better known as OCSP Stapling, is a modification of the OCSP protocol, where the TLS server (instead of the TLS client) contacts the OCSP responder at regular intervals to provide him with the revocation status of its certificate. A server application, such as Apache or OpenVPN, can use a CRL to deny access to clients that are no longer trusted. The new certificate has a chain of trust from the new cert, through an intermediate CA to my root ca. Normally only the -CApath, -CAfile, -CAstore and (if the responder is a 'global VA') -VAfile options need to be used. But Exchange always reports that the new certificate fails the revocation check and will not use it. This guide covers the implementation of certificate revocation status checking using the Online Certificate Status Protocol (OCSP). The process is as follows: Obtain the certificate you wish to check for revocation. Jul 2, 2021 · 1 TL;DR; How to discover what is wrong with OCSP response on Windows? I am trying to install a new certificate in on-premises Exchange Server 2019. Encrypt and decrypt files. Mar 18, 2024 · It’s important to check the serial number and fingerprint of each certificate before installation. Sep 5, 2021 · But normally to revoke a certificate we also need the actual certificate file but in this case we actually don't have the certificate. 509 world, revocation status can be ascertained by downloading and validating CRL (Certificate Revocation Lists) or obtaining OCSP responses from OCSP responders (an OCSP response is a kind of CRL reduced to a single target certificate). By caching certificate status on the server and sharing it during the TLS handshake, OCSP stapling ensures faster, more secure connections. Aug 19, 2019 · In a recent question, I outlined the steps for verifying a wildcard SSL certificate for connecting to PostgreSQL from a remote client (using the same wildcard certificate I use for my web server). 509 certificates revocation status. So how do we revoke missing or lost certificate using OpenSSL? How do you check if a certificate has been revoked? To check the revocation status of an SSL Certificate, the client connects to the URLs and downloads the CA’s CRLs. txt" etc. We can validate the serial number and fingerprint of a certificate using OpenSSL. May 8, 2024 · Step by step instructions to revoke or delete certificate from keystone and generate CRL Certificate Revocation List) using openssl in Linux with example openssl generate crl. Jul 15, 2025 · Certificate Revocation Checking: Windows checks for revoked certificates using CRLs and OCSP. This requires me to setup a OCSP responder. If revoked, the certificate cannot be trusted, and secure connections fail. OCSP does not provide real-time information about the status of a certificate. Jun 18, 2025 · Revocation Status Even if a certificate is valid and signed by a trusted CA, it may be revoked before its expiration date due to compromise or other issues. How long are crls cached for? Jul 31, 2025 · Using the certificate private key If you did not originally issue the certificate, but you have a copy of the corresponding private key, you can revoke by using that private key to sign the revocation request. OCSP – Online Certificate Status Protocol confirms revocation status in real-time OCSP is more convenient compared to downloading large CRLs – but requires online access. When various alternative approaches are possible, the guide presents each of them and specifies their use cases to help you choose which approach suits your needs best. Jan 24, 2020 · - Troubleshooting Certificate Status and Revocation which is the initial version of the whitepaper (don’t know why this document is still out there) - Certificate Revocation and Status Checking which is the updated version of the initial whitepaper Certutil. Nov 5, 2024 · A Certificate Revocation List (CRL) is a critical component of Public Key Infrastructure (PKI) that helps maintain the integrity and security of digital certificates. Nov 27, 2021 · You can also use the OpenSSL x509 command to check the revocation status of an SSL certificate. Feb 29, 2012 · The openssl ca -config openssl. In the Private Key Test window, you should see a green checkmark next to the Revocation check for certificate chain was successful. openssl is like a universe. Jan 10, 2018 · Manually check certificate revocation status from OCSP responder This is a multi-step process: Retrieve the certificate from a remote server Obtain the intermediate CA certificate chain May 28, 2019 · Summary: Certificates calling to OCSP Responder (OCSPr) have their "Cert Status" change from "good" to "unknown" with no known to changes to environment. How do I verify certificate revocation list? Jan 24, 2025 · Certificate revocation has always felt a bit opaque to me - I’m aware that the from a WebPKI perspective, browser behaviour has been varied and has not necessarily made revocation checking a reliable feature of the trust model. 13 Checking OCSP Revocation If an OCSP responder is malfunctioning, sometimes it’s difficult to understand exactly why. By following the steps outlined in this guide, individuals can ensure that a certificate is genuine and has not been revoked. Learn how to verify certificates using OpenSSL. It is an alternative to the CRL, certificate revocation list. The connection to server was tried with openssl s_client and specifying the certificate chain in the "cert" parameter but it fails. - openssl-certificate-authority Nov 16, 2024 · 0 answers 364 views Question on Chrome's Certificate Revocation Checking I would like to understand how Chrome checks for certificate revocation status when validating SSL certificates. Or maybe DigiCert had briefly published a CRL to the wrong URL and we ended up caching that badness on your machine. Combining multiple CRLs into a single file using SSLCARevocationFile can improve performance compared to SSLCARevocationPath, which searches for individual CRL files in a directory. The guide covers basic aspects of initiating a secure TLS connection, including certificate validation and hostname verification. As is usually the case with SSL, the best approach is to use OpenSSL for troubleshooting. pem -CRLfile crl. I have extracted the a certificate from a cable modem, copied it to my PC and converted it to the PEM format. The response looks like this: See full list on michalspacek. Open a certificate you want to check against and go to the Details tab and scroll down to the CRL Distribution Points. google. In the X. Initially the OCSP responder certificate is located and the signature on the OCSP request checked using the responder certificate's public key. My guess is you've loaded the list, but not asked it to actually check for revocation. I revoke them by: openssl ca -config config. This content is reproduced with the author's permission. Remember to always verify the certificate's validity before trusting it. This is the preferred method over CRL by utilizing OCSP responders to return a positive, negative, or unknown status. ? This guide demonstrates how to act as your own certificate authority (CA) using the OpenSSL command-line tools. The procedure consists of the same steps as it was presented in c++ and c# codes: find OCSP URL, get server certificate and certificate chain, send OCSP request. Revoked certificate If you have a revoked certificate, you can also test it the same way as stated above. Mar 22, 2015 · OpenSSL Verify We now have all the data we need can validate the certificate. Does the OpenSSL check the signature, issuer key/name hashes of the response? 2. Here’s a breakdown of its key aspects: Purpose Revocation 2. I think I want to use the Cert* API so that I can get the benefit of the Windows certificate store. pem user. Usually that means that you need to provide CRL (Certificate Revocation List) files. Create self-signed certificates. CRL was first released to provide the CA with the ability to revoke certificates, however due to limitations with this method it was superseded by OCSP. It is an alternative to CRL or Certificate Revocation List s. Now I want to register it in the OpenSSL OCSP database and start a server. To do this, type openssl x509 -in certificate_file -CRL This will print the Certificate Revocation List to the terminal. If the server supports OCSP stapling, you'll see the details of the OCSP response in the data, including the signature over it. Look for the certificate serial number in the CRL. Similar to CRLs, OCSP enables a requesting party (eg, a web browser) to determine the revocation state of a certificate. Dec 16, 2020 · You can use the openssl s_client command with the -status flag to send a certificate status request to the server. Jan 31, 2023 · Check certificate revocation using PowerShell. This is what I've come up with. exe is the command-line tool to verify certificates and CRLs. pem Parent topic: Client certificate authentication problems and solutions Check the OCSP status of your X509 certificate using the domain name or by pasting the contents of your Base64 encoded certificate. Verify the client certificate with the trusted certificates, for example: openssl verify -CAfile ca-chain. Online Certificate Status Protocol (OCSP)/Certificate Revocation List (CRL) checking is performed against remote incoming certificates. This method is better than Certificate Revocation List (CRL). My usual approach is to use OpenSSL for quickly probing with OCSP for the status of a certificate if I want to do a manual test, as I like the way OpenSSL displays the OCSP May 27, 2025 · Consider using Online Certificate Status Protocol (OCSP) as an alternative to CRLs for potentially faster and more efficient revocation checking. Oct 9, 2025 · If you want to check your SSL certificate manually, you can do so by using the openssl command. Steps using openssl to check a certificates signature and revocation status - manual-certificate-checking. exe to create root and client certificate The problem is that certutil fails to check Jun 5, 2023 · The online certificate status protocol (OCSP) is used to check x. " Asked 2 years, 7 months ago Modified 2 months ago Viewed 35k times Aug 22, 2018 · I'm using OpenSSL to verify a signed code in a custom PKI. Using openssl s_client -connect doesn't work because PostgreSQL doesn't seem to want to do the SSL handshake right away. Checking certificate revocation status from the command line is possible, but it’s not quite straightforward. The SSL Checker makes it easy to verify your SSL certificates by connecting to your server and displaying the results of the SSL connection. cer – text – noout You can also use the OpenSSL x509 command to check the expiration date of an SSL certificate. May 26, 2024 · In this tutorial we will cover different examples using openssl command, so in short let's get started with our openssl cheatsheet. This this example, we’ll use openssl s_client to connect and fetch the certificate. &quot; I have used openssl and other tools to check revocation status, result is… I first looked at what CA issued the certificate for https://www. As mentioned in RFC-5280 page 55, if the CRL's designated certificates extend beyond the scope of CRL's issuer, it qualifies as an indirect CRL. Nov 22, 2024 · OCSP stapling streamlines SSL/TLS certificate validation, addressing the performance, privacy, and reliability challenges of traditional methods. com Certificate revocation lists A certificate revocation list (CRL) provides a list of certificates that have been revoked. Explained here what is CRL, common causes of revoked certificate, advantages disadvantages, how to check the certificate for CRL revocation? This method implies adding revoked certificates to a special list created by the Certificate Authority. I’d like to understand a bit more of the internal workings of revocation mechanisms and what the current CA and browser approach is. cnf -revoke cert. e. Check revocation status of your SSL certificate online via OCSP protocol. Dec 8, 2020 · Yes, the correct way to verify a chain is with using the "untrusted" parameter of openssl verify to specify the intermediate certificate. To do this, type “openssl x509 -in certificate_file -checkend N” where N is the number of days in the future you want to check. To do this, you can check the CDP (Certificate Distribution Point) location on a certificate. Apr 13, 2016 · And of course the certificate might have been revoked in the last minutes but the response is still valid, i. Basically, OCSP is a mechanism where a client can ask the CA if a certificate is valid. The revocation function was unable to check revocation because the revocation server was offline. Could someone please explain what method Chrome uses to verify whether a certificate ssl-certificate certificate actions-on-google Entities that want to check the revocation status of a certificate do not have to download the complete list of all revoked certificates thanks to OCSP, but can make a specific request for the certificate in question to the online responder. pem I update CRL by: openssl ca -config config. Deinitialize The only prerequisite for this guide is that the SSL *s_connection variable has already been initialized. It is a list published by a Certificate Authority (CA) that contains the serial numbers of certificates that have been revoked before their scheduled expiration date. pem index. May 9, 2023 · To check the status of a certificate, you can use methods like Online Certificate Revocation List (CRL), Online Certificate Status Protocol (OCSP), browser checks, and command-line tools like OpenSSL. Also, monitor certificate revocation status. pem Parent topic: Client certificate authentication problems and solutions I want to verify an SSL certificate in Win32 using C++. crt We should as well do revocation checks OpenSSL: TLS guide This guide describes the implementation of a TLS client in OpenSSL. After receiving the OCSP response from the OCP Responder, the TLS server stores this response for a defined I set up a CA and signed some cert request. The first steps overlap with OCSP checking; to complete them follow the instructions in Section 2. Dec 9, 2015 · Certificate revocation lists ¶ A certificate revocation list (CRL) provides a list of certificates that have been revoked. To be more specific, the serial number of the end-entity certificate is added by the Certificate Authority to the Certificate Revocation List (CRL). pem Parent topic: Client certificate authentication problems and solutions I'm trying to write a script which validates certificate chain in PowerShell (that all certificates in the chain are not expired) and finds the certificate which is closest to expiration. pem Verify the client revocation status with the trusted certificates, for example: openssl verify -crl_check -CAfile ca-chain. We work Apr 29, 2024 · What is certificate revocation? Sectigo explores what happens when an SSL certificate is revoked, what a CRL is, and the process of renewing an SSL. Besides querying certificates for data or from remote endpoints (using s_client) it's useful to verify certificates in regards of revocation. Nov 27, 2021 · openssl x509 -text -in certificate. " Dec 1, 2023 · Describe the bug ssl error winhttp_callback_status_flag_cert_REV_failed failed to check revocation status I tried restarting my computer but it didn't work and when I Online Certificate Status Protocol (OCSP)/Certificate Revocation List (CRL) checking is performed against remote incoming certificates. txt s OCSP Response verification. Jul 29, 2025 · Microsoft Exchange 2010 was designed to check a certificate's revocation status, to prevent administrators from inadvertently configuring Exchange to use a revoked SSL certificate. Calculate message digests. Check out server implementation issues and … OCSP Stapling: Secure and Efficient Certificate Validation OCSP stapling streamlines SSL/TLS certificate validation, addressing the performance, privacy, and reliability challenges of traditional methods. Feb 24, 2014 · If an OCSP responder is malfunctioning, it is often difficult to understand why exactly. Apr 21, 2022 · Therefore any organization relying on PKI needs a way to check if a cert has been revoked using some system beyond the certificate itself. Certificate revocation lists A certificate revocation list (CRL) provides a list of certificates that have been revoked. Create certificate signing requests (CSRs). Pretty much this is request for additional information for the question: OpenSSL certificate revocation check in client program using OCSP stapling I want to know how OpenSSL actually handles OCSP stapling response. pem will be the actual step to revoke the certificate, producing a signed list using the private key of the authority. My hierarchy is : RootCA -> SubCA1 -> SubCA2 -> EndUser. For example, I skip encryption and decryption, or using openssl for CA management. Feb 3, 2017 · A Certification Authority publish the status of the certificates using Online Certificate Service Protocol (OCSP) and Certificate Revocation Lists (CRL). This is useful in a number of situations, such as issuing server certificates to secure an intranet website, or for issuing certificates to clients to allow them to authenticate to a server. pem file); I downloaded the corresponding CRL (certificate revocation list) from here (this is the gtglobal. Completely lost on this one. Oct 17, 2022 · openssl is probably your tool of choice when it comes to certificates. Online Certificate Status Protocol (OCSP) provides applications a way to determine the revocation status for a digital certificate. More Detail: I have been building a simple suite for Certificate creation and OCSP handling for local and personal certificate testing and the such. " Asked 2 years, 7 months ago Modified 2 months ago Viewed 35k times Alternatively the responder certificate itself can be explicitly trusted with the -VAfile option. The OCSP server is only useful for test and demonstration purposes: it is not really usable as a Dec 9, 2015 · Online Certificate Status Protocol ¶ The Online Certificate Status Protocol (OCSP) was created as an alternative to certificate revocation lists (CRLs). Jun 25, 2025 · Learn what causes SSL connect errors, how to troubleshoot them in browsers, APIs, and CLI tools, and how to fix issues related to certificate validation. It seems that may be exists some kind of callback for my connecting to ocsp server function or something like that. This command will allow you to view information about the certificate, including the issuer, expiration date, and more. After the Certificate Authority (CA) revokes an SSL Certificate, the CA takes the serial number of the certificate and adds it to their certificate revocation list (CRL). 13, Checking OCSP Revocation. Compared to CRL's: Since an OCSP response contains less information than a typical CRL (certificate revocation list), OCSP can use networks and May 24, 2019 · In openssl errors i found this define - x509_err_ocsp_verify_needed, but i don't understand how it uses. GitHub Gist: instantly share code, notes, and snippets. Obtain Jul 12, 2023 · Regular SSL Certificate Maintenance: To ensure a secure online presence, regular SSL certificate maintenance is crucial. CRLs need to be obtained from the issuing CAs and kept up-to-date Oct 17, 2024 · Try certutil -user -verify <servercert> as the same user that runs the curl command and look for errors other than revocation like "A certificate chain could not be built to a trusted root authority. Apr 4, 2025 · OCSP or Online Certificate Status Protocol is an internet protocol that checks the validity status of a certificate in real-time. The server provides its certificate during the handshake and the client has to check the revocation status of t Jun 1, 2025 · Conclusion Verifying a certificate with OpenSSL is a straightforward process that involves using various commands to check the certificate's validity, details, and revocation status. Check the revocation status of a single certificate After successful verification of the downloaded CRL’s signature, the revocation status of the provided certificate can be examined against the current CRL. crt -noout Example: openssl x509 –in hydssl. pem wikipedia. Jan 4, 2018 · SSL certificate revocation and how it is broken in practice Explore certificate revocation solutions: CRL, OCSP, OCSP stapling, must-staple, CRLSets. Turns out it is GeoTrust Global CA; I downloaded the GeoTrust Global CA root certificate from here (this is the GeoTrust_Global_CA. I added additional tracing to my app and I see that it fails for each certificate in the chain with the error "The revocation function was unable to check revocation because the revocation server was offline". . Jun 3, 2020 · To check revocation for the SSL certificate installed on a web server, first get the certificate. Certificate revocation status that is checked via OCSP provides more up-to-date status information than is available through CRLs. Now in a lab environment we have added an intermediate standalone certific Aug 30, 2023 · I would like to understand the ocsp process and how to check if a certificate is still valid using openssl. Sep 4, 2016 · Revocation status for a certificate in the chain for CA certificate 0 for stealthpuppy Issuing CA could not be verified because a server is currently unavailable. CRL Certificate revocation list contain a list of the serial number that have been Jul 4, 2014 · This article shows you how to manually verfify a certificate against an OCSP server. Regularly check for certificate expiration dates. Jul 28, 2020 · So these revoked certificates will appear in the CRL at the next published updates and you can check against the CRL for revoked certs. These methods allow you to confirm if a certificate is valid or has been revoked. Sep 13, 2023 · 1) Downloading Certificate Revocation List published by the certificate authority (CA) 2) By Querying the Online Certificate Status Protocol (OCSP) Server/Responder for status of single certificate. Apr 10, 2019 · OCSP stands for the Online Certificate Status Protocol and is one way to validate a certificate status. Connectivity or configuration problems with these mechanisms can cause unexpected validation failures. Then, the client searches through the CRL for the serial number of the certificate to make sure that it hasn’t been revoked. Apr 6, 2017 · Checking OCSP revocation using OpenSSL Exist two types of revocation methods, CRL (certificate revocation list) and OCSP (Online Certificate Status Protocol). Is it c Jul 21, 2021 · If you want to check if the certificate was valid according to the CA you may want to check the revocation status as well. Verify, encrypt, and sign S/MIME email. You could perform a full verification check with chains and whatnot by using: openssl verify -verbose -attime <etc> Mar 15, 2020 · The issuer of a Certificate Revocation List (CRL) doesn't always have to be associated with the certificates revoked. For instance, if you see that a private key has accidentally been made public, you can use this method to revoke certificates that used that private key, even if you are not the person Oct 18, 2017 · Please help me to deal with self-signed revocation check I've used makecert. 0x80092013 (-2146885613 CRYPT_E_REVOCATION_OFFLINE). You need to perform the following steps: Obtain the certificate that you wish to check for revocation. The following tools are required in order to initiate a check: - OpenSSL Jan 22, 2025 · I'm following this guide to check for CRL revocation for all the certificates in the certificate chain: https://x509errors. Check the revocation of a certificate involves several steps: Extract the CRL distribution point and OCSP url from AIA extension included in the X509Certificate Download the CRL and check if the serial number of your certificate is included Apr 14, 2024 · “Online” certificate revocation status checks using Certificate Revocation List (CRL) or OCSP URLs included in certificates are disabled by default. org/guides/openssl-crl This is the relevant Oct 12, 2018 · To do an OCSP check to find out if a certificate is revoked, you need to send an OCSP request to the OCSP responder responsible for the certificate and then look at the returned OCSP result. Clients may check the revocation status of a certificate using mechanisms like Certificate Revocation Lists (CRLs) or the Online Certificate Status Protocol (OCSP). $ openssl verify -crl_check -CAfile crl_chain. The OCSP server is only useful for test and demonstration purposes: it is not really usable as a Discover the importance of certificate verification through OCSP, CRL, and revocation. Jun 8, 2022 · Hi Microsoft Team, We have a certificate revoked by CA but when I open the certificate in windows, the certificate viewer still show: &quot;This certificate is OK. Obtain the issuing certificate. There are two main options for how this is done: Using Certificate Revocation Lists (CRLs) or using Online Certificate Status Protocol (OCSP). Apr 12, 2023 · The service has enabled revocation chain validation for the SSL domain certificate of the given service. cnf -gencrl -crldays 30 -out crl. md Apr 2, 2025 · The server checks the certificate's revocation status using mechanisms like CRL (Certificate Revocation List) or OCSP (Online Certificate Status Protocol). OCSP Response follows the rules specified in RFC2560. So my guess is that if this certificate is marked as revoked, we fail the check on revocation reason But what if another certificate higher in the chain is revoked ? how do I provide this piece of information to pkcs7_verify ? Certificate Authorities (CAs) are required to keep track of the SSL Certificates they revoke. Download and verify the CRL. So my guess is that if this certificate is marked as revoked, we fail the check on revocation reason But what if another certificate higher in the chain is revoked ? how do I provide this piece of information to pkcs7_verify ? May 29, 2020 · From openssl help verify I suspect (but am not in a position to verify) that you want either -crl_check or -crl_check_all (and, possibly, -extended_crl). Then a normal certificate verify is performed on the OCSP responder certificate building up a certificate chain in the Alternatively the responder certificate itself can be explicitly trusted with the -VAfile option. Convert certificate files between various formats. Aug 22, 2018 · I'm using OpenSSL to verify a signed code in a custom PKI. This probably requires at least the following things: An API to pass things like stapled OCSP responses to the X509_STORE_CTX. Checking certificate revocation status from the command line is possible, but not quite straightforward. 1 - Testing a valid certificate I have the following cert that's still valid: valid-cert. It runs the following checks: Whether the server is giving out the correct intermediate certificates so there are no untrusted warnings in users' browsers The certificate's expiration date - The SSL Checker even lets you set up a reminder of a certificate Sep 15, 2017 · An OCSP client issues a status request to an OCSP responder and suspends acceptance of the certificate in question until the responder provides a response. This is because unless a client, like Chrome, refuses to connect to a website if it cannot get a valid response, online checks offer limited security value. It can be used to sign certificate requests (CSRs) in a variety of forms and generate certificate revocation lists (CRLs). Apr 27, 2017 · We have a root certificate authority made with OpenSSL. It also maintains a text database of issued certificates and their status. Nov 21, 2018 · This arg should hold the certificate which is the issuer of the lower-most certificate in the pkcs7 chain. Running the following command will return the serial number and SHA1 fingerprint: $ openssl x509 -noout -serial -fingerprint -sha1 -inform dem - in RootCertificateHere. How can I verify the CRL of each node of the cert hierarchy. Oct 3, 2009 · I was playing the other days with the Online Responder from Windows Server 2008. Understanding these techniques helps maintain security in digital communications. Questions are: 1. From a quick look at the psql documentation, I could not find a command-line parameter that makes it show that information on startup. com. The process checks the whole chain involved from the personal certificate of the remote system right through to its root certificate. If a certificate is on this list, it has been revoked and should not be trusted. I can verify the CR Apr 7, 2023 · SSL certificate validation fails with 'The revocation function was unable to check revocation because the revocation server was offline. We would like to show you a description here but the site won’t allow us. Jun 4, 2020 · If you can figure out how you got into a bad state (which seems like it would be "build a chain for this certificate, then build a chain for this other one"), that'd be useful for figuring things out. A client application, such as a web browser, can use a CRL to check a server’s authenticity. pem: OK Above shows a good certificate status. I'm using Implement OCSP or CRL checks yourself We should add options, for instance X509_V_FLAG_CHECK_REVOCATION and X509_V_FLAG_CHECK_REVOCATION_ALL, that will use either OCSP or CRL to verify the revocation status. cnf -gencrl -out crl/crl. Certificate Authorities (CAs) are required to keep track of the SSL Certificates they revoke. You never know where it ends. Test client-side and server-side TLS/SSL with HTTP and SMTP servers. Apr 4, 2023 · It demonstrates how to send Online Certificate Status Protocal (OCSP) request to CA server about certificate revocation status using openssl terminal commands. OCSP stands for the Online Certificate Status Protocol and is one way to validate a certificate status. Create certificate revocation lists (CRLs). NOTES As noted, most of the verify options are for testing or debugging purposes. Out there might be several OCSP clients that you can use for manual OCSP probing for a status of a certificate (if OCSP is supported). In general two mechanisms are in place that provide certificate revocations CRL - certificate revocation lists OCSP - online certificate status protocol CRL is more a static approach Oct 18, 2025 · In the DigiCert Certificate Utility for Windows©, click SSL (gold lock), select the SSL Certificate that you want to check, and then click Test Key. Everything has been going well, and there hasn't been any issues List ciphers suites Manually check certificate revocation status from OCSP responder Surely, this is not a complete list, but it covers the most common use cases and includes those I’ve been working with. Staying Up-to-Date with OpenSSL: To maintain optimal security, it’s essential to keep OpenSSL installations up to date and stay informed about new releases and security Apr 27, 2013 · I read this answer (Openssl - How to check if a certificate is revoked or not) but the link towards the bottom (Does OpenSSL automatically handle CRLs (Certificate Revocation Lists) now?) gets into material that's a bit too involved for my purposes (a user uploading a revoked cert is a far out edge case).