Topic Last Modified: 2006-05-16

The Microsoft® Exchange Server Analyzer Tool queries the user-defined server and tries to open a socket connection to the specified server on the default configuration of TCP port 25 or a user-defined port. If the Exchange Server Analyzer does not receive an expected custom response of xx Available, where xx is the default port of 25 or the alternative port number defined by the user, the Exchange Server Analyzer displays an error.

This error indicates that the server cannot be accessed on the desired TCP port and that failures may occur. To correct this error, you can troubleshoot the connectivity problem with the server.

To troubleshoot the connectivity problem with the server
  1. Can you telnet to the desired port from the designated server itself? If not, the problem is not with the network.

  2. Is everything plugged in? Is all your hardware functioning correctly?

  3. Is DNS working and configured correctly?

  4. Is your router functioning correctly?

  5. Are there any firewalls preventing you from connecting?

For more information about how to troubleshoot server connectivity issues, see "Microsoft Exchange Server Best Practices Analyzer Tool Troubleshooting Connectivity Problems" (