H.5.3 Testing the POP3 Service

You can also use Telnet to connect to the POP3 service running on the NetWare server. To test whether or not you can connect to the POP3 service, start a Telnet client application on any local workstation, and attempt to open a connection to the POP3 port. For example, to test the POP3 service using the Windows 95 Telnet client, type "pop3" in the "Port" edit box of the "Connect" dialog box, as shown in Figure H.18 below:

Figure H.18 Using Windows 95's Telnet client to test the POP3 service.

Once the Telnet client connects to the POP3 service, you should see a POP3 "+" confirmation prompt, indicating that the connection was allowed, as illustrated in Figure H.19 below. Type "quit" to close the connection.

Figure H.19 Windows 95's Telnet client connected to the NetWare POP3 service.

If you are unable to connect to the POP3 service from a local workstation, then you will need to investigate the following:

1. Verify that the POP3 service is running on the server. Use TCPCON's "TCP Connection" menu to determine this, as described in section H.2.5 View the Active Applications and Services.
   
   
2. Verify that the client has an entry in its local SERVICES file for the POP3 service. If not, then the Telnet client will not be able to locate the appropriate TCP port to use for the POP3 service.
   
   
3. Verify that the client can PING the server.
   
   
4. If both systems are on the same network, then verify that the client and the server are both using the same sub-net mask.
   
   
5. See if any routers between the two systems are blocking packets on the POP3 port. Some administrators configure firewalls and routers to block traffic on the POP3 port. You may need to consult with other system administrators, consultants or service providers to verify this.
   

STEP: To continue to the next step in the troubleshooting process, go to section H.6 Debugging Mail Delivery Problems.

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