Losing Internet Connectivity

[Ryan Wood]

I'm trying to troubleshoot a problem that is getting worse
on my network. After the night that I applied the April
patches via SUS, 3 PC's started losing network
connectivity intermittantly. When I try to ping directly
after reboot and login, it works fine, but maybe 2-5
minutes later, it randomly loses connections. I can ping
my exchange server (with IP or name), but only the first
packet (out of the default 4) will get a reply, the rest
time out. At the same time, I can ping my other laptop,
and get 0% loss. It works sometimes, and doesn't other
times, on any IP.

Today (over a week later) I had 6 more machines start
doing this. I run Symantec Corporate with defs updated
daily on Win2k Professional pc's. Some are SP3, some are
SP4. The CPU Usage doesn't hit 100% - but losing
connectivity practically freezes the PC.

The only way I've been able to fix these PC's is by wiping
and re-imaging. Adding a different network card doesn't
fix it.

If anyone has any ideas, please post here and email me at
(e-mail address removed) (remove the NOSPAM.)

 

[Roland Hall]

in message : I'm trying to troubleshoot a problem that is getting worse
: on my network. After the night that I applied the April
: patches via SUS, 3 PC's started losing network
: connectivity intermittantly. When I try to ping directly
: after reboot and login, it works fine, but maybe 2-5
: minutes later, it randomly loses connections. I can ping
: my exchange server (with IP or name), but only the first
: packet (out of the default 4) will get a reply, the rest
: time out. At the same time, I can ping my other laptop,
: and get 0% loss. It works sometimes, and doesn't other
: times, on any IP.
:
: Today (over a week later) I had 6 more machines start
: doing this. I run Symantec Corporate with defs updated
: daily on Win2k Professional pc's. Some are SP3, some are
: SP4. The CPU Usage doesn't hit 100% - but losing
: connectivity practically freezes the PC.

I'm running Symantec Corporate Edition also and no issues.

: The only way I've been able to fix these PC's is by wiping
: and re-imaging. Adding a different network card doesn't
: fix it.

Correct. If a software rebuild solves the issue then changing out hardware
is not an alternative.
When you reimage, do you add the updates?
Perhaps telling us some config information might help and providing relevant
information like ipconfig.
What is the date of your definition files?
Does the system go south before or after you logon?

--
Roland Hall
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