![How to fix Error code: SEC_ERROR_UNKNOWN_ISSUER 18002402551 on secure websites by 1-8002402551 Browser Technical Support Phone Number - issuu How to fix Error code: SEC_ERROR_UNKNOWN_ISSUER 18002402551 on secure websites by 1-8002402551 Browser Technical Support Phone Number - issuu](https://image.isu.pub/170410132730-d0424abe66bb8467ae0f6394bd694a63/jpg/page_1_thumb_large.jpg)
How to fix Error code: SEC_ERROR_UNKNOWN_ISSUER 18002402551 on secure websites by 1-8002402551 Browser Technical Support Phone Number - issuu
![your connection is not secure for google and some mozilla sites | Firefox Support Forum | Mozilla Support your connection is not secure for google and some mozilla sites | Firefox Support Forum | Mozilla Support](https://user-media-prod-cdn.itsre-sumo.mozilla.net/uploads/images/2018-03-13-11-45-59-b25c2e.png)
your connection is not secure for google and some mozilla sites | Firefox Support Forum | Mozilla Support
![I get an I get an](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
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