I would have replied but I got rudely interrupted by some mod stuff, then it was time for sleep...
anyhoo, do you think you could find a way to get the error the host recieves posted? it would open up a bunch of fixes.
personally, I haven't had this problem, I've run a few LAN servers with bots and I can use irons just fine, but it could be something as simple as a bug in some code.
try hosting an internet server and seing if it does the same thing. if it does, then it's something larger than I think (I've just got a few hunches here, no real evidence to back it up. that's why, if possible, a condump would be handy...TBH, I haven't seen this before, and hopefully one of the other mods can help a bit more.
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