[jschefdog]

One more piece of information that might help. I tried running gateway.php again with the debugging version of nntp.php that Gilby posted and showqueries=1. Here is the output (changed the server and group names since they are inside our firewall). The reponse from the server would seem to indicate that it's connecting, but IE says done in a few seconds and it never retrieves any posts. Any tips on how to debug this problem would be appreciated. I'm trying this on a test system, not my production vBulletin install, so I can try just about anything.

1 group(s) gatewayed.
200 internal.server.name.com NNTPcache server V2.3.3 [see www.nntpcache.org] (c) 1996-1998 Julian Assange May 30 2000 ready (posting ok).
Logging in to internal.server.name.com, group group.name
Query: SELECT post.postid,post.username,post.userid,post.datelin e,post.attachmentid,post.pagetext,post.showsignatu re,post.ipaddress,thread.pollid,thread.title,post. threadid,thread.forumid FROM thread,post WHERE post.isusenetpost=0 AND thread.threadid=post.threadid AND post.dateline=thread.dateline AND post.userid=thread.postuserid AND (thread.forumid=10)
Time before: 0.524605035782
Time after: 0.528924942017

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Query: SELECT post.postid,post.username,post.userid,post.datelin e,post.attachmentid,post.pagetext,post.showsignatu re,post.ipaddress,thread.title,post.threadid,threa d.forumid,thread.msgid,thread.prefix FROM thread,post WHERE post.isusenetpost=0 AND thread.threadid=post.threadid AND (thread.forumid=10)
Time before: 0.529515981674
Time after: 0.533061981201

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Query: UPDATE session SET lastactivity=1024014495,location='/test_vb2/gateway.php?showqueries=1' WHERE sessionhash='b70bb4c090bf80e2c6b0b5e5b1ab3daa'
Time before: 0.535089015961
Time after: 0.536486029625

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Query: UPDATE user SET lastactivity=1024014495,inforum='0' WHERE userid='1'
Time before: 0.53685605526
Time after: 0.538607001305