I've set up a server running Jenkins. The web-interface doesn't have SSL/TLS support turned on by default, and I have not attempted to turn it on, and do not want to turn it on (for now at least).

When I set this server up, (at say, example.com:7070), I accidentally typed in the url to visit it as https://example.com:7070, rather than http://.... The Jenkins server either didn't serve a TLS cert, or didn't know how to, but either way, I got a ERR_SSL_PROTOCOL_ERROR. This is seemingly correct, as it didn't negotiate a TLS connection correctly.

What isn't correct, however, is that if I now try to go to http://example.com:7070, (the non-HTTPS url), I get auto-redirected by Chrome straight to https://..., and I can't convince it to go to the non-TLS version of the site. Of course, that means I just continue to get the ERR_SSL_PROTOCOL_ERROR again, meaning I can't get to the site.

The site works absolutely fine (over http://...) in e.g. Firefox/Safari, so I can only conclude Chrome is somewhere storing information on TLS certs, and has incorrectly stated that it is expecting a TLS connection, and won't connect to the site without it.

Any suggestions or thoughts? How can I delete this information? (I've tried clearing browser history/cache to no avail.)

  • 5
    Check if the HTTPS request sent a HSTS header. That headers means "never contact me on HTTP, auto-switch to HTTPS". It's strange the browser accepted such header on a broken HTTPS connection... See classically.me/blogs/how-clear-hsts-settings-major-browsers for clearing that HSTS data
    – Xenos
    Commented Feb 3, 2017 at 17:01
  • Excellent, thank you! Please post this as an answer and I'll accept it.
    – Savara
    Commented Feb 3, 2017 at 17:07
  • @Xenos HSTS can only be sent with a response (not request) and ERR_SSL_PROTOCOL_ERROR means there was no connection through which a response could return from the server to browser. Looks like a Chrome-specific quirk, which gets cleared together with HSTS data.
    – kubanczyk
    Commented Feb 6, 2017 at 13:51
  • braindetour.com/2017/02/hsts-gitlab-and-letsencrypt
    – Savara
    Commented Feb 7, 2017 at 14:36


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