After the upgrade from 2.204 to 2.205 jenkins redirects to http(s)://127.0.0.1/ after login.
Workaround: For Apache: set "ProxyPreserveHost On" as documented in https://wiki.jenkins.io/display/JENKINS/Running+Jenkins+behind+Apache
*Jenkins LTS Notice*: Jenkins LTS 2.204.3 and 2.204.4 are also affected due to the Winstone upgrade which was introduced as a part of the
JENKINS-57888 fix backporting. Please see https://groups.google.com/forum/#!topic/jenkinsci-dev/M_RtDuDXtbU for the discussion and retrospective