I just upgraded JIRA Software/Core from 8.21 to 9.1. We are able to log into JIRA to open tickets, and we can directly access tickets. However, when we try to access administrative menus such as Projects we get an error -
HTTP Status 405 - Method Not Allowed
Type Status Report
Description The method received in the request-line is known by the origin server but not supported by the target resource.
Apache Tomcat/9.0.63