Do you get the same error if you try accessing the UMP with a different browser? from a browser on a different system?
Have you tried clearing the browser cache from "the beginning of time" from the browser where you are seeing the ERR_TOO_MANY_REDIRECTS message? If the problem continues after clearing the browser cache, deactivate the wasp probe on your UMP robot(s). Delete the following directories and their contents on your UMP robot(s):
- <installPath>\Nimsoft\probes\service\wasp\work
- C:\Windows\temp\liferay (for Windows) or /tmp/liferay (for Linux/UNIX)
Both of these directories cache data used by the UMP portals which may be stale. The directories will be recreated and repopulated with fresh data when the UMP is restarted.
Activate the wasp probe on your UMP robot(s).
You might also want to check out the following site for some other things that you can try to resolve this error:
How to fix ERR_TOO_MANY_REDIRECTS in Chrome?