This is a classic DNS problem. When I looked at
/etc/resolv.conf, it looked like this:
Every time a Windows machine tried to access the Unix box, Unix
would do a reverse DNS lookup, using the 192.74 address. If the
Internet happened to be down, it would hang a long time trying to
get an answer - eventually it would give up, but it was too long
for their Windows client application, which effectively just gave
up too soon. If the Internet was up, the SCO box would get an
immediate "no idea" answer, and would continue quickly. I showed
the NT folk that if you were patient enough, telnet would actually
connect, but the client application they used just wasn't
This isn't a Unix thing: this would happen with NT or just about
any OS I know of; they want to do a reverse DNS lookup when a
My first thought at fixing this was to make the nameserver point
at their internal NT DHCP server which, according to the three NT
guys, should provide DNS information for the local network as well
as knowing how to get to other nameservers when necessary. However,
that didn't work. Not my fault: the NT machine knew nothing about
its own DHCP clients. The NT folks were surprised, and said they
were sure they could fix it, but that it would take a reboot which
was agreed by one and all was Not A Good Idea Right Now.
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