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Cannot browse LAN, but still surfing the net

 
 
Plastic Man
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      8th Feb 2005
Hi folks, funny story.

We disconnected one of the reliable work-horses (our antivirus server)
from the LAN to use the ethernet connection on the wall temporarily for
the boss's laptop upgrade. We've done this many many times before
without issue. This time, upon reconnecting the ethernet cable, there
is no access to the LAN by the antivirus machine.

It doesn't matter what plug on the wall we use or what log-in name we
use (yes, the permissions are all high enough). We've reinstalled the
networking components countless times. No luck.

Oddly though, we can ping all other network computers, refresh the IP
from the DHCP server, surf the web, and receive email.

So far, there's some registry tweaks about NODE TYPES and such that are
discussed on Google. But nothing describes the sudden loss of a
previously robust connection.

Perhaps this tidbit is irrelevant, but we have added two new users to
our domain in recent days. I am 99% sure we have CAL's for several more
clients. And surely upon log-in we'd be informed if we were refused
authentication to the domain?

Any ideas?

Plastic Man

 
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Luke MacNeil
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      10th Feb 2005
Were any changes made to the AV machine or the LAN while it was
disconnected?
Your saying you can't access the LAN, but what exactly is it that your
trying to do?
Access a share? Login to the domain?

If you run a ping -t against an internal address are there any
dropouts?

My first guess is the network cable. I ran into a situation similar
although a WAN. I was able to touch other servers, but I couldn't stay
authenticated to the servers. The problem was kerberos. Kerberos sends
its packets by default by UDP packets, which means it tosses them out
and doesnt check to make sure they were recieved.. so these UDP packets
were getting dropped at the router. There was a registry tweak that
forced kerberos to communicate via TCP, and that ensures that the
systems will be authenticated.

This is why I suspect the network cable. It could easily be
intermittent and dropping large numbers of packets. Could also be a
defective port on your router, hub, switch, whatever.

Hrm.

Let me know if that helps,

Luke.

 
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