Hey,

I have recently updated Jenkins from version 2.73.3 to 2.121.1 and I am now encountering an error message about our reverse proxy configuration being broken. Regardless of the warning, everything is working fine so far. I didn't change anything besides swapping the jenkins.war and updating some plugins.

I have tried everything from this wiki page:

• Jenkins URL configured in the System Configuration matches the URL we're using to access Jenkins
• set X-Forwarded-Proto header but it didn't help
• running the cURL script lead to a 400 Bad Request

I also checked similiar JIRA-issues but unfortunately couldn't find anything applicable.

Any other idea? FYI we're running Jenkins in a Tomcat 8 Container behind a F5 load balancer.

Kind regards,
Robin