I had a ISA server 2000, which was also running AD, DNS and Exchange server, but due to overload, I installed another ISA server and stopped all the ISA server services on the old server. Now every client can browse internet through the new ISA server, and those new PCs, which installed firewall client after the creation of the new ISA server, can connect to msn properly. but the problem is that the old PCs which used to connect to msn messenger through the old ISA server, are unable to connect messenger through the new ISA server.Though they can browse internet without any problem. I reinstalled the firewall client on that PCs but still unable to connect.. Their firewall clients can update to the new ISA server name, but doesnt show any activity when connecting to messenger.. When I move my cursor on the Firewall Client icon in system tray, it shows something like "server NETWORLD is inaccessible" (NETWORLD is the old server ISA server and doesnt use any ISA services anymore). Please help me solve this problem as soon as possible Regards Taha