When entering the IP address in the "Receiver Configuration" it sometimes happens that if only one or two digit numbers are entered the remaining space is filled with blanks.
This is a problem for go2M.

Open the conf file in the user directory with an editor (Notepad++) and remove the blanks in the IP address.

Another "trick" if it's not working:
If the receiver can't be accessed, open the conf file with Notepad++ and save again immediately.