Dear isalister.... I have a problem with connection to mail server (exchange server 2000) via isa server. in the isa server, i use protocol rules and destination set for some user group. my problem is when client will connect to pop3 (ex. abc.com) failed, but it's connect normally to the other mail server(not abc.com), but if i restart microsoft firewall service, it will run normally again, but it happend again in 1-2hours later.... i have this problem since 2 weeks ago...before that, it didn;t happend... does anyone know about this problem... anycomment would be appreciated.. Amos D. Galiardo