![How to Fix Firefox SEC_ERROR_UNKNOWN_ISSUER Easily | Best home automation, Antivirus program, Home automation system How to Fix Firefox SEC_ERROR_UNKNOWN_ISSUER Easily | Best home automation, Antivirus program, Home automation system](https://i.pinimg.com/736x/07/c3/aa/07c3aa8b674254ce4f4db2ede67782da.jpg)
How to Fix Firefox SEC_ERROR_UNKNOWN_ISSUER Easily | Best home automation, Antivirus program, Home automation system
![I get an "unknown issuer" error, then after I add an exception I get the same error but can't add exception | Firefox Support Forum | Mozilla Support I get an "unknown issuer" error, then after I add an exception I get the same error but can't add exception | Firefox Support Forum | Mozilla Support](https://user-media-prod-cdn.itsre-sumo.mozilla.net/uploads/images/2017-01-27-06-51-22-7f90b5.png)
I get an "unknown issuer" error, then after I add an exception I get the same error but can't add exception | Firefox Support Forum | Mozilla Support
![a id="errorCode" title="SEC_ERROR_UNKNOWN_ISSUER">SEC_ERROR_UNKNOWN_ISSUER</a> | Thunderbird Support Forum | Mozilla Support a id="errorCode" title="SEC_ERROR_UNKNOWN_ISSUER">SEC_ERROR_UNKNOWN_ISSUER</a> | Thunderbird Support Forum | Mozilla Support](https://user-media-prod-cdn.itsre-sumo.mozilla.net/uploads/images/2016-07-24-09-57-31-c23c3e.png)
a id="errorCode" title="SEC_ERROR_UNKNOWN_ISSUER">SEC_ERROR_UNKNOWN_ISSUER</a> | Thunderbird Support Forum | Mozilla Support
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