From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Tue, 16 Dec 1997 13:21:48 +0100
From: Boyd Roberts boyd@france3.fr
Subject: [9fans] need help with u9fs
Topicbox-Message-UUID: 6e8490ec-eac8-11e9-9e20-41e7f4b1d025
Message-ID: <19971216122148.7rAWx8ZkKX71tpGAKj3wQUy0XXyboIxe15VXOKBGhh0@z>

    From: Steve_Kilbane@cegelecproj.co.uk

    Waaay back why I was setting up u9fs on my Solaris box, according
    to the logs, the connecting machine wasn't considered valid
    (I think the getpeername() was failing, though memory's vague).

don't you mean gethostbyaddr()?  the reverse dns lookup after getpeername().
it's unlikely getpeername() is going to fail, unless the code is bust :-)