It doesn't look like a monkey patch. Those aren't invisible in tracebacks.
Follow the code path higher until you do get some effect.
I've seen odd things before, but I agree, it isn't likely that it's a monkey patch. Chances are that some product is outdated.
I would imagine it's some sort of redirect. I would start with using the IP address: usually this is enough to avoid the redirect. Otherwise, find out how to turn "access rule" off. I think this may be in Zope/doc/SECURIY.txt.
I don't think it's possible to really remove the Zope Control Panel.
You can't overwrite the manage URL with Zope, it's just not allowed. I suspect there's some external URL rewriting happening here. Either that or the guy was a real PITA and rewrote Zope to work with his pet ideas. -- Phillip Hutchings http://www.sitharus.com/ sitharus@gmail.com / sitharus@sitharus.com