Network Connectivity Problems

Here is my situation. I have a Windows 2003 Server with Service Pack 1.
This server is also running Exchange. This was the Standard Version of
Exchange and it was later upgraded to the Enterprise Version. It is now
running SP2 for Exchange. I do not think it is an exchange issue but I could
be wrong.

My problem is that several times during the day I will loose connectivity to
this server. This means that I am unable to ping the IP Address. This seems
to happen to the Workstations in the office but not from other servers. At
least if I RDP to a Domain Controller I can still ping the Mail Server from
the DC even though I am not able to ping from the workstation.

I have reviewed the event logs on the Mail server as well as other servers
and there is nothing there that points to a problem. I have reviewed the
Event Logs on the workstation and there are no errors that point to an error
there as well. It just seems to be a loss of connectivity.

In regards to DNS, it is configured properly because my IP addresses are
resolving properly. And I am trying to ping with the IP address directly as
well. I took the time to do an ipconfig /flushdns, nbtstat -R, and even an
arp -d * and nothing seems to bring the connectivity back immediately. All I
can do is wait for the server to repsond on its own.

I am just not sure of what I can look at next to determine why connectivity
just stops and then starts again because I am not seeing any errors anywhere
to tell me where to look. I would appreciate any assistance anyone can
provide.
--
Thank You,
Donald Palmer, MCSE

Do you have IPSec or any other encryption between your servers? That might be
causing it. Look at your traffic in your LAN too this might help too. Also
hardware maybe causing it so i recommend doing more test to see if any of
these causing the problem.

Thanks

Serkan Varoglu
MCSE

"Donald Palmer" wrote:

> Here is my situation. I have a Windows 2003 Server with Service Pack 1.
> This server is also running Exchange. This was the Standard Version of
> Exchange and it was later upgraded to the Enterprise Version. It is now
> running SP2 for Exchange. I do not think it is an exchange issue but I could
> be wrong.
>
> My problem is that several times during the day I will loose connectivity to
> this server. This means that I am unable to ping the IP Address. This seems
> to happen to the Workstations in the office but not from other servers. At
> least if I RDP to a Domain Controller I can still ping the Mail Server from
> the DC even though I am not able to ping from the workstation.
>
> I have reviewed the event logs on the Mail server as well as other servers
> and there is nothing there that points to a problem. I have reviewed the
> Event Logs on the workstation and there are no errors that point to an error
> there as well. It just seems to be a loss of connectivity.
>
> In regards to DNS, it is configured properly because my IP addresses are
> resolving properly. And I am trying to ping with the IP address directly as
> well. I took the time to do an ipconfig /flushdns, nbtstat -R, and even an
> arp -d * and nothing seems to bring the connectivity back immediately. All I
> can do is wait for the server to repsond on its own.
>
> I am just not sure of what I can look at next to determine why connectivity
> just stops and then starts again because I am not seeing any errors anywhere
> to tell me where to look. I would appreciate any assistance anyone can
> provide.
> --
> Thank You,
> Donald Palmer, MCSE