Troubleshooting tips

These troubleshooting tips enable you to solve basic TCP/IP problems.

You can find out how to check logs and verify that your interfaces and other network components are active.

If you are experiencing problems related to TCP/IP, you should check for error messages in the QTCP message queue located in library QUSRSYS. Many errors relating to TCP/IP functions get logged in this message queue. To display the QTCP messages, enter DSPMSG QUSRSYS/QTCP on the command line.

• Server table
  You can use this server table as a reference to find out how servers, server jobs, job descriptions, and subsystems are mapped to one another.
• Check jobs, job logs, and message logs
  You can view jobs, job logs, and messages to identify problems and make adjustments to solve them.
• Check for active filter rules
  You can find out if filter rules are limiting your communication.
• Verify system startup considerations for networking
  Learn how to start subsystems, TCP/IP, interfaces, and servers in the correct order and learn how to locate problems associated with startup.
• Vary on lines, controllers, and devices
  Let TCP/IP vary on your lines, controllers, and devices automatically.
• Verify the logical partition configuration
  You might need to verify that the logical partition (LPAR) configuration is correct.
• Troubleshoot IPv6–related problems
  Use these tips to troubleshoot IPv6.