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Troubleshooting network connection issues caused by firewall configuration

This article troubleshoots network connection issues caused by firewall configuration.

Incorrect firewall configuration may cause virtual machine network connection failures.

To resolve connection issues caused by firewall configuration:

Change the Windows XP firewall settings to allow ICMP echo requests. For more information, see Cannot ping Windows XP virtual machine from outside (1004897) .

Note: Patch updates may enable ICMP blocking.
Use the Telnet tool to verify that the other computer permits connections on the port you are using to connect. Run the command:

telnet <IP address> <port>, where <IP address> is the IP address of the other computer and <port> is the port you are attempting to make a connection on

If you do not receive an error message, the other computer is configured to permit connections on that port. If you receive an error message, the other computer may not be configured to permit connections on that port. Contact your network administrator to obtain a valid port number.

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