Incorrect output (server)
Problems with incorrect output are reported when the data sent to the client is not seen in its expected form. This could be garbled data that is unreadable on the screen, a blank screen when output is expected, or screen formatting problems. These problems are generally traced back to logmode issues. Ensure the primary and alternate screen sizes in the logmode used are correct for the TN3270 or TN3270E emulator that you are using. The logmode coded in the TCPIP profile is suggested to VTAM® as the correct logmode for this device type. The VTAM PLU application determines the actual logmode that is used. Therefore this application must be configured correctly to use the appropriate logmode.
If a problem is recreatable, you can use the Telnet DEBUG features. See z/OS Communications Server: IP Configuration Guide for details.