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hpntbast101_11 - 11 - Appendix B - List of Ports Used by Windows NT version 4.0 Function Static ports Windows NT Browsing UDP:137,138 DHCP Lease UDP:67,68 DHCP Manager TCP:135 Directory Replication UDP:138 TCP:139 DNS Administration TCP:135 DNS Resolution UDP:53 Event Viewer TCP:139 File Sharing TCP:139 Logon Sequence UDP:137,138 TCP139 NetLogon UDP:138 Pass Through Validation UDP:137,138 TCP:139 Performance Monitor TCP:139 PPTP TCP:1723 IP Protocol:47 (GRE) Printing UDP:137,138 TCP:139 Registry Editor TCP:139 Server Manager TCP:139 Trusts UDP:137,138 TCP:139 User Manager TCP:139 WinNT Diagnostics TCP:139 WinNT Secure Channel UDP:137,138 TCP:139 WINS Replication TCP:42 WINS Manager TCP:135 WINS Registration TCP:137 Convoy Clustering (WLBS) Convoy UDP:1717 WLBS UDP:2504 Exchange Client/Server Comm. TCP:135 Exchange Administrator TCP:135 IMAP TCP:143 IMAP (SSL) TCP:993 LDAP TCP:389 LDAP (SSL) TCP:636 MTA - X.400 over TCP/IP TCP:102 POP3 TCP:110 POP3 (SSL) TCP:995 RPC TCP:135 SMTP TCP:25 NNTP TCP:119 NNTP (SSL) TCP:563 Terminal Server RDP Client (Microsoft) TCP:3389 (Pre Beta2:1503) ICA Client (Citrix) TCP:1494 DCOM RPC high ports By default DCOM dynamically allocates one high port (>1023) per process. There is a way to limit the port mapper to only a specific range of ports. You must decide how many ports you want to allocate, which is equivalent to the number of simultaneous DCOM processes through the firewall. You must open all of the UDP and TCP ports corresponding to the port numbers you choose. In addition, you must open TCP/UDP 135, which