Çözüldügüne sevindim asagidaki gibi bir cozum daha mevcut ayni sorunu yasayip belirttiginiz sekilde cozulmedigi durumlarda kullanilabilir.

1- Open the ADAM ADSIEDIT from C:\WINDOWS\ADAM\ADAM-adsiedit.msc and a new MMC will be opened.
2- Create a new connection to your ISA Server on port 2171 and select the naming context as Configuration.
3- From left side of MMC expand the CN=Configuration >> CN=Sites >> CN=Default-First-Site-Name >> CN=Servers and delete the CN="Server Name" you are having the problem with.

Emre.