What causes the SEC_ERROR_OCSP_INVALID_SIGNING_CERT error?
We investigated this particular issue by looking at various user reports and the strategies that they used to circumvent the error message. As it turns out, there are a couple of scenarios that are known to produce this particular error message: If you’re currently trying to resolve the SEC_ERROR_OCSP_INVALID_SIGNING_CERT error, this article will provide you a couple of troubleshooting guides. Down below, you’ll find a couple of methods that other users in a similar situation have used to get the issue resolved. Note: We urge you to follow the methods below in the order that they are presented.
Method 1: Setting the correct date & time
A lot of users have reported that the error message was resolved and they were able to access the website normally after they modified the Date and time settings to the current values. If your date & time settings are severely outdated, the web server you’re trying to access will refuse the connection for security reasons. Here’s how to ensure that you have the correct date & time settings: If you’re still encountering the SEC_ERROR_OCSP_INVALID_SIGNING_CERT, move down to the next method below.
Method 2: Disabling OCSP Stapling
Another common cause for the SEC_ERROR_OCSP_INVALID_SIGNING_CERT error is if the OCSP security connection mechanism fails for one reason or another. Although it’s not recommended, you can circumvent the issue by instructing Firefox to skip this security procedure entirely. Just remember to reverse engineer the steps below once you are done using the website in question. Here’s what you need to do: Note: Keep in mind that an OCSP connection (just like an HTTP connection) can be affected by add-ons and ad-blockers. If the error message is still not fixed or you’re encountering a different one, try to disable every active add-on and then re-enable them systematically until you discover the culprit.
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