

Antivirus software can sometimes misidentify safe websites and block your access to them.

Synchronization issues between desktop and mobile browsers can corrupt a Firefox profile, triggering the Firefox secure connection failed error. In this case, the browser enforces a cipher version that’s not supported either by Firefox or the website. It may happen when you’ve modified SSL settings on your computer or browser. If not configured correctly, VPN and proxy services can trigger PR_END_OF_FILE_ERROR. A VPN and a proxy server act as a middle man between your computer and website server, hiding your IP address and location.

It is a Firefox-specific error and won’t appear in any other browser. The PR_END_OF_FILE_ERROR error message appears when the Mozilla Firefox browser can’t establish a secure connection.
