WIZ750SR Client Mode does not work

I have a WIZ750SR-105 module with F/W v1.2.4
When I set the module to TCP server mode, everything works OK.
But when I set it to TCP-CLient or Mixed mode, the module does not seem to be working.
I have been struggling with this for a week.
Any Idea?

In TCP client mode and TCP mixed mode, the destination IP address and port number to be connected to WIZ750SR module must be set correctly.

The ‘Remote host / port’ settings of the Configuration tool is the destination IP address and port number for the TCP connection. Please check these settings.