X11 and Firewall problems.

In MacOS 10.5.1, I had been able to run xterm on a remote host and open the window on my Mac, but suddenly it has stopped working and I cannot figure out what the cause is.
1) On my Mac, I have disabled the firewall.
2) On my Mac, in X11 preferences, I have unchecked "Authenticate Connections" and I have checked "Allow connections from network clients."
3) On my Mac, in an Xterm window, I have entered the command "xhost +", which results in the message "access control disabled, clients can connect from any host"
4) On the remote system, I have set my DISPLAY environment variable to my hostname:0.0
5) I then type xterm on the remote host, but the following error is displayed:
Xlib: connection to "172.31.225.11:0.0" refused by server
Xlib: No protocol specified
xterm Xt error: Can't open display: 172.31.225.11:0.0
6) On my Mac, I look in the Console log and I see this message:
11/17/07 1:05:00 AM [0x0-0x6c06c].org.x.X11[655] AUDIT: Sat Nov 17 01:05:00 2007: 656 X11: client 3 rejected from IP 172.16.3.82
How can I get my Mac to stop rejecting the connection?

I am having the same problems. I have sniffed the network connections and see that the Mac is returning the message "No protocol specified."
My goal was to get an X client on a Linux system display to the X server on a Macintosh running 10.5.1 but got this message. I am able to start an X client (xclock, for example) on the Macintosh and have it display to the X server on Linux. After sniffing the networks, both sides are sending the same info but the Mac seems to be replying with that "no protocol specified" message. I have even tried a 10.4.11 system. In fact, I can't get the Mac's to display on each other; they can, however, of course, display locally.
Any clues????

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I've been trying to install Matlab on my Powerbook, 10.4.11....I insert the CD's that came with the Powerbook to install X11...
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X11 and Firewall problems.

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