Hi, I have a strange situation where in, our users are not able to connect to mainframe as they are getting blank LU number. After bit research we came to know that some geek is making multiple connections to our mainframe ip address. In our SYS1.TCPPARMS(TN3270) member it has been defined DEFAULTLUS TCPA00001..TCPA00500 ENDDEFAULTLUS , so the geek is making roughly 500 connection from his single IP ( probably doing it by programatically ).
How do we prevent multiple connections coming from a single IP address ? , I'm new to system programming on mainframe, please help.