You can verify that basic jobs are running.
TCP/IP requires that certain basic jobs are running. For normal usage, you need to have the QTCPIP job running in the QSYSWRK subsystem. The QTCPIP job controls starting and ending TCP/IP interfaces. However, you can run TCP/IP when the operating system is in the restricted state. In this case, the QTCPIP job is not active.
In addition, you should have at least one job for each of the servers you are attempting to use.
To verify the required jobs, select one of these interfaces: