We have just upgraded two Jenkins instances to release 2.270. We have not changed the general configuration of the instances. They both run behind an apache proxy.

After login jenkins is redireceted to 

http://jenkins.ruv.de:8080/jenkins_ew/

The original url is https//jenkins.ruv.de:8443/jenkins_ew/. The http-adress

http://jenkins.ruv.de:28080/jenkins_ew/.

The login works fine anyway and after loading the orignal https-url everything works fine.

But as soon as you log out the error occurs again.

Any idea if the error is on our side or if it is a bug.