Problem with PCs Losing Internet Connection But Have Access To LAN

We have a Win2003 Standard Server which is running AD, DNS, DHCP, RRAS. We
have about 50 WinXP/Vista PCs that sometimes lose Internet connection. They
are able to browse the network just fine, they are able to hit the server
without a problem, but they just can't access the Internet.

If we remove the PC from DHCP and provide them a static IP, everything seems
to start working. After a while(1 day, 1 week, or more) the computer will
have the same sympton again. Switching the PC back to DHCP fixes the
problem for a while.

We are seeing this problem slowly spreading to more PCs. We can't see to
pin point where the problem is or why this is happening.

Any advice?

Does your Firewall have limits on the number of users or devices that can be
used from behind it? I've seen one office that has a Watchgaurd Firewall
with a 15 user limit. They only have 11 machine, but after some outside
machines were started up the LAN the firewall "remembered" the MAC addresses
and would not allow a new replcement machine to be added on the LAN. Power
cycling the firewall "cleared it" and everything was fine.

--
Phillip Windell
www.wandtv.com

The views expressed, are my own and not those of my employer, or Microsoft,
or anyone else associated with me, including my cats.
-----------------------------------------------------

"StinkyDuck" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> We have a Win2003 Standard Server which is running AD, DNS, DHCP, RRAS.
> We have about 50 WinXP/Vista PCs that sometimes lose Internet connection.
> They are able to browse the network just fine, they are able to hit the
> server without a problem, but they just can't access the Internet.
>
> If we remove the PC from DHCP and provide them a static IP, everything
> seems to start working. After a while(1 day, 1 week, or more) the
> computer will have the same sympton again. Switching the PC back to DHCP
> fixes the problem for a while.
>
> We are seeing this problem slowly spreading to more PCs. We can't see to
> pin point where the problem is or why this is happening.
>
> Any advice?

We don't have a limitation on the firewall. This was one of the reasons
that we went with the firewall that we have.

We think that its a problem with our Win2003 server. We use it like a proxy
server but not really. It has 2 nic cards (LAN/WAN).


"Phillip Windell" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> Does your Firewall have limits on the number of users or devices that can
> be used from behind it? I've seen one office that has a Watchgaurd
> Firewall with a 15 user limit. They only have 11 machine, but after some
> outside machines were started up the LAN the firewall "remembered" the MAC
> addresses and would not allow a new replcement machine to be added on the
> LAN. Power cycling the firewall "cleared it" and everything was fine.
>
> --
> Phillip Windell
> www.wandtv.com
>
> The views expressed, are my own and not those of my employer, or
> Microsoft,
> or anyone else associated with me, including my cats.
> -----------------------------------------------------
>
> "StinkyDuck" <(E-Mail Removed)> wrote in message
> news:(E-Mail Removed)...
>> We have a Win2003 Standard Server which is running AD, DNS, DHCP, RRAS.
>> We have about 50 WinXP/Vista PCs that sometimes lose Internet connection.
>> They are able to browse the network just fine, they are able to hit the
>> server without a problem, but they just can't access the Internet.
>>
>> If we remove the PC from DHCP and provide them a static IP, everything
>> seems to start working. After a while(1 day, 1 week, or more) the
>> computer will have the same sympton again. Switching the PC back to DHCP
>> fixes the problem for a while.
>>
>> We are seeing this problem slowly spreading to more PCs. We can't see to
>> pin point where the problem is or why this is happening.
>>
>> Any advice?
>
>

"StinkyDuck" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> We don't have a limitation on the firewall. This was one of the reasons
> that we went with the firewall that we have.
>
> We think that its a problem with our Win2003 server. We use it like a
> proxy server but not really. It has 2 nic cards (LAN/WAN).

Why would you create a duel-nic server running NAT if you already have a
firewall? It seems pointless.

--
Phillip Windell
www.wandtv.com

The views expressed, are my own and not those of my employer, or Microsoft,
or anyone else associated with me, including my cats.
-----------------------------------------------------
Understanding the ISA 2004 Access Rule Processing
http://www.isaserver.org/articles/IS...cessRules.html

Troubleshooting Client Authentication on Access Rules in ISA Server 2004
http://download.microsoft.com/downlo...7/ts_rules.doc

Microsoft Internet Security & Acceleration Server: Partners
http://www.microsoft.com/isaserver/p...s/default.mspx

Microsoft ISA Server Partners: Partner Hardware Solutions
http://www.microsoft.com/forefront/e...epartners.mspx
-----------------------------------------------------