I have 2 Openbsd boxes, 1 Freebsd box and a WinXP sitting behind a
Linksys router that is connected to a cable modem.

I'm not running any filters on any of these boxes. They're all default
installs.

I have no trouble connecting to my ISP's news server using the FreeBSD
box (using tin) or the Windows box (using OE), but I can't get to it
from either of the OBSD boxes (using tin or "telnet news 119").

I can ping the news server (and everything else that I care to try).

I've used traceroute, and after discovering the -P ICMP flag, I was
able to trace all the way to the server. Traceroute using UDP doesn't
return anything.

/etc/mygate is set to the address of my Linksys router when I'm
connected to it, or to the address of my ISP's router when I'm not
connected to it. This I got from their documentation.

resolv.conf is set to include my ISP's nameservers, which, again, I
got from their docs. I can resolve any name I choose. Using an IP
address
makes no difference.

From OBSD I can issue SMTP, HTTP, FTP, and DNS requests without any
trouble. I only have an issue when trying to get to their news server.

One other thing...I've run tcpdumps and can see TCP connection attemps
leaving the OBSD boxes, but I never see anything coming back. It
doesn't work when I connect one of the OBSD boxes directly to the
cable modem either. I'm not sure why this would be the case or what
else I can check.

There's nothing on my end that I can think of that would prevent me
from issuing NNTP requests, especially since everything else seems to
work, and so I'm at a loss.

Oh, and one other thing. This was working up until a couple months
ago. I changed nothing on my end, I swear.

Any help would be greatly appreciated.