I would like to disable RPCSS.exe to close port 135. I understand (from the Avast! thread) that renaming the file rpcltscm.dll to a .txt extnesion *may* lobotomize the server functionality of RPCSS.exe (and hence close pesky port 135). But has anyone actually successfully done this on an NT/2000/XP machine? I understand NT systems rely heavily on RPC, and may not boot if RPC functions are modified or switched off. Can anyone confirm this workaround works on NT systems with no ill effects?