A side effect of this is that you will lose any certificates or security exceptions that you had added. When you restart Thunderbird it should create a new "certificate store" with default values (certificates). Use Help -> Troubleshooting Information -> Show Folder to open Windows Explorer (your file manager) at your profile, exit Thunderbird, and then delete the cert8.db file. If you add a permanent security exception and keep getting prompted to add the same security exception again and again, the certificate store may be corrupt. This article applies to Firefox, Thunderbird, Mozilla Suite and SeaMonkey.Ī security exception is a way to tell Thunderbird that you understand that there is something wrong with the SSL certificate but you've decided that you're willing to take the risk, so Thunderbird should make the secure connection anyways and not bother you about it anymore (unless it gets a different bad certificate later on). (Redirected from Security Error: Domain Name Mismatch or Server Certificate Expired)
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