Firefox PR_END_OF_FILE_ERROR — Secure Connection Failed

Overview

Firefox PR_END_OF_FILE_ERROR indicates an SSL/TLS handshake failure where no common encryption protocol could be negotiated with the server.

Key Details

• Error code: PR_END_OF_FILE_ERROR in Firefox's NSS library
• The browser and server could not agree on a TLS version or cipher suite
• Common when servers only support outdated TLS versions (1.0/1.1)
• Can also occur when security software intercepts HTTPS and presents incompatible ciphers
• Firefox shows 'Secure Connection Failed' with this specific error code

Common Causes

• Server only supports TLS 1.0 or 1.1 which Firefox has deprecated
• Antivirus or firewall performing SSL inspection with incompatible ciphers
• Firefox TLS settings modified to be too restrictive
• Server certificate chain incomplete
• Corporate proxy rejecting the connection during handshake

Steps

1. 1Check if the site works in Chrome — if yes, it is a Firefox-specific TLS config issue
2. 2Temporarily disable antivirus SSL/HTTPS inspection
3. 3Check Firefox TLS settings: about:config > search security.tls.version.min (should be 3 for TLS 1.2)
4. 4Reset Firefox TLS settings: about:config > search security.tls > reset all modified entries
5. 5If the server only supports TLS 1.0/1.1, contact the website admin to upgrade

Tags

More in Firefox Errors

Frequently Asked Questions