HTTPS not working after jenkins upgrade (only HTTP)

Upgraded Jenkins from weekly 2.396 to LTS 2.401.1 release, and HTTPS no longer works in the browser. HTTP does work. /var/lib/jenkins/config.xml files are the same before and after other than version. URL returns “ERR connection refused”.

Any suggestions?

whether https is used or not is not stored in the config.xml
This depends how you run jenkins. If you use the built in winstone/jetty, then this is a parameter on the command line. Consult the documentation for details.

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