As a test I reinstalled CentoS. I planned to stop at verious points and see whether the IP was showing up in the xauth list. I installed CentOS, and my output was:
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[myuser@server1 ~]$ xauth list
server1.mydomain.com/unix:1 MIT-MAGIC-COOKIE-1 <hash>
Then I did a yum update and ran the command again, got the same result. Then I installed tiger VNC using "yum install tigervnc-server". I've done nothing else to this device, and at this point I'm seeing the IP in the xauth list:
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[myuser@server1 ~]$ xauth list
207.148.248.143:1 MIT-MAGIC-COOKIE-1 <hash>
server1.mydomain.com/unix:1 MIT-MAGIC-COOKIE-1 <hash>
It's got to be related to tiger VNC. The strange thing is that we use tiger VNC at work and I do not get this result. The firewall at work may be more sophisticated than my cable modem but if it's the software on the server that's initiating a connection back to 207.148.248.143 then it'll be considered an established connection and will be allowed. So I see no reason why this should be happening on a server at my home but not on one at work.
I guess I'll go over to the Tiger VNC forum and see what they can tell me.