Article ID: 200898
This article was previously published under Q200898
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One way of using Systems Management Server through a firewall is to configure the firewalling or proxy server to allow standard and (MS) RPC port traffic to pass.
Systems Management Server UDP InformationWhen NetBIOS over TCP/IP is selected for Systems Management Server Remote Control, the system uses the following ports:
Port 137 - name resolution Port 138 - messaging (sending the screen image) Port 139 - client sessions
When NetBIOS over NWLink is used, the router must forward Type 20 packets (the packets that provide NetBIOS support).
Microsoft Windows NT UDP InformationThe following list contains the core UDP ports that Windows NT uses and their function:
To list established connections, type netstat -a from a command prompt. This returns additional UDP ports that a computer running Windows NT Server or Windows NT Workstation is using beyond the core, due to additional services or applications installed on the Windows NT system.
DNS udp 53 DHCP udp 67 RPC TCP 135 WINS udp 137 NetBIOS datagrams udp 138 NetBIOS datagrams tcp 139 NetBIOS sessions TCP 139
Microsoft SQL Server UDP InformationIf you are using TCP/IP Net-Library, enable port 1433 on the firewall. Use the HOSTS file or an advanced connection string for host name resolution.
If you are using Named Pipes over TCP/IP, enable port 139 for NetBIOS functions. UDP ports 137 and 138 can be enabled for NetBIOS name resolution using b-node broadcast, but this is not recommended. Instead, a WINS server or LMHOSTS file should be used.
When SQL Server 6.x is configured to listen on TCP/IP, it uses TCP (not UDP) port 1433 by default. This port can be configured by running SQL Server Setup on the server and clicking the Change Network Support option. If the default port 1433 is used, the client Net-Library works by default. If a custom port number is used, the client needs to specify that port in the DSN.
Security NotesFor added security, using IP filters with your firewall server can be configured to allow only "registered" addresses use of the ports. There are certain security concerns created by enabling specific ports on a proxying or firewalling server. For additional information about these concerns, visit http://www.microsoft.com/security
Another method of providing Systems Management Server site, client, and administrative communication through a firewall could be to use the Systems Management Server RAS Sender with a Point to Point Tunneling Protocol (PPTP; TCP port 1723) client and server to configure which port is used for initializing the session, then allow that specific port to be open on the firewall server.
Remote Tools:For more information about remote tools, click the following article numbers to view the articles in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/167128/ )Network ports used by remote Helpdesk functions
(http://support.microsoft.com/kb/256884/ )TCP and UDP ports used by remote control have changed in SP2
Other Related InformationFor additional information, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/826852/ )Ports that Systems Management Server 2003 uses to communicate through a firewall or through a proxy server