While opening up the TDM Portal URL in a sandbox environment, the following error message is displayed:
HTTP Status 404 - /TestDataManager/ - the requested resource is not available - Apache Tomcat /8.0.28
This Sandbox had rt.jar and resources.jar files missing in the jre folder under TDM portal jre.
The Sandbox had rt.jar and resources.jar files were missing in the jre folder under TDM portal. These were restored from the working production server and all worked. Why they were missing is an unknown since this was an open sandbox to anyone in the QA and Dev departments to use and even do abusive testing with. No logs were kept as to who did what and when. The environment was re-established as a working environment, thus allowing TDMPortal to work.
An example of a Directory comparison tool can be found here: