I suspect that this has already been defined, but I cannot find any reference to it.
Setting secure areas on an intranet secured by URL rules within bordermanager can be bypassed by changing some of the characters in the URL with %-encoded triplets. To access http://home.myintranet.com/secure use http://home.myintranet.com/s%45cure
It doesn't work for characters in the main domain name, nut sub-folders seem to work ok.
I haven't seen any mention of this in any TIDs or service packs for BM, so I assume the fault carries over into version 3.5?
Regards, Kevin R Smith