Invalid msg showing up in the tracing window of Visimage can be caused by a Buffer overflow or invalid ascii characters from environment variables on a HPUX host.

Example 1:
MANPATH environment variable contains strange characters as the last path entry and an Invalid msg immediately follows.

Solution 1 :
Append MANPATH=SHORT to the /ASKPLUS/vsrvtcp.ini profile block that contains the default settings.

 
Example 2:
IFS environment variable exists when typically it is only a shell variable.

Solution 2a :
Modify the UC4 job that starts the listener to contain unset IFS prior to the launch of the listener.

Solution 2b :
Login to the HPUX host as the askplus user, stop the listener, enter unset IFS and then start the listener.