Adam Carter writes: > Wireshark has an X11 decoder. For tcpdump you could try -vv or -vvv but > i would just go straight to wireshark it will almost certainly be more > useful. Of course if its inside an ssh tunnel you will only see ssh > with a packet sniffer. If you're on the local box sniff lo0.
Thanks! I think this will help me with my problem. I had to start a 2nd X server to test this, though. Nowadays, X starts with '-nolisten tcp' option, and so there is no communication over port 6000. But when I started another X server manually, and changed the DISPLAY variable from ':1' to 'localhost:1', I saw the X traffic on port 6001. Thanks again, Wonko