SSL_ERROR_RX_RECORD_TOO_LONG SSL / TLS Origin: Network Last updated 4 Nov 2026

Firefox: Secure Connection Failed — SSL received a record that exceeded the maximum permissible length. Error code: SSL_ERROR_RX_RECORD_TOO_LONG

Firefox sent a TLS handshake but received plain HTTP back — you used https:// on a port that serves HTTP.

Exact message you may see SSL received a record that exceeded the maximum permissible lengthSecure Connection Failed SSL_ERROR_RX_RECORD_TOO_LONGError code: SSL_ERROR_RX_RECORD_TOO_LONG
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Seen on: SSL Nginx

Meaning

Most often the site is not configured for TLS on that port: Apache/Nginx listening on 443 without ssl, a development server on 8080 with HTTP only, or an https:// link to a non-TLS service. Use http:// or enable TLS on that port.

Common causes

  • https:// used against an HTTP-only port
  • Nginx listen 443; without ssl
  • Apache vhost on 443 without SSLEngine on
  • Proxy forwarding HTTPS to an HTTP backend port
  • Dev server (Node/Python) started without TLS

⚡ Quick fix

  1. Use http:// or the correct port
  2. Add ssl to the listen directive and load certificates
  3. Check: curl -v http://host:port vs https://host:port

Detailed fix by platform

Linux

  1. curl -v https://host:8080 2>&1 | head shows wrong version number when the port speaks plain HTTP

How to diagnose

  1. Port — TLS enabled?
  2. Scheme — http vs https?
  3. Config — ssl on?

🔧 Still not fixed?

Many errors look alike. If the steps above didn’t solve it, one of these is probably what you’re facing:

Where this error sits

Origin: Network. Errors that are often confused with or caused by this one (click to open):

ERR_SSL_PROTOCOL_ERROR — ERR_SSL_PROTOCOL_ERROR (This site can't provide a secure connection) (JavaScript)ERR_SSL_PROTOCOL_ERRORno "ssl_certificate" is defined for the "listen ... ssl" directive — Nginx: [emerg] no "ssl_certificate" is defined for the "listen ... ssl" directive in /etc/nginx/sites-enabled/default:3 (SSL / TLS)no "ssl_certificate" …SEC_ERROR_EXPIRED_CERTIFICATE — Firefox: Peer's Certificate has expired. Error code: SEC_ERROR_EXPIRED_CERTIFICATE (SSL / TLS)SEC_ERROR_EXPIRED_CER…SSL routines: wrong version number — OpenSSL: error:1408F10B:SSL routines:ssl3_get_record:wrong version number (SSL / TLS)SSL routines: wrong v…SSL_ERROR_BAD_CERT_DOMAIN — Firefox: Websites prove their identity via certificates — the certificate is only valid for other names. Error code: SSL_ERROR_BAD_CERT_DOMAIN (SSL / TLS)SSL_ERROR_BAD_CERT_DO…Timeout during connect (likely firewall problem) — Let's Encrypt: Fetching http://example.com/.well-known/acme-challenge/token: Timeout during connect (likely firewall problem) (SSL / TLS)Timeout during connec…tlsv1 alert protocol version — OpenSSL: error:14094410 / SSL alert number 70 — tlsv1 alert protocol version (SSL / TLS)tlsv1 alert protocol …SSL_ERROR…

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