Re: Internet Access and external email problems
- From: WingCommander <WingCommander@xxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Mon, 11 May 2009 05:14:07 -0700
Last week I managed to replace the PIX, fully updated with the Latest COS and
patches. Also, previously I got my local ISP to come out and change my cable
modem, and clean up any and all noise or problems with my connection. I have
confirmed to the best of my knowledge that no other DNS servers exist
internally on my network, and that the existing DNS server on my SBS server
is working with no errors.
I have spent all weekend long having to reset the PIX remotely as it goes up
and down. At this point, I am out of ideas. Whatever is happening appears
to be timed, as it goes usually goes out nightly between 6:00 and 8:00 p.m.,
then on Fridays around noon to 1:00, then all weekend long. These are off
peak times, so I find the "internal DNS is overloaded" answer to be
misguided, esp. considering as stated here (by you guys) before that the
internal DNS only resolves internal calls, and the external DNS calls are
forwarding to the ISP's DNS servers.
Is there any way that this could be due to the size of the SBS network? I
know that the limit on SBS is 75 users, and I am currently running at about
70 users who heavy use exchange and other network functions.
Is there a way to offload the DNS server function from SBS onto another
server? If not, I have previously had DNS on another server but have
uninstalled it to troubleshoot this problem. Should I bring DNS back online
as a secondary DNS server, and if so are there any guidelines I should use?
do you gentlemen have any other suggestions that I might try? I have been
working on this issue off and on for about 8 months and it is becoming an
embarrassment and a hindrance to production.
Your assistance and patience with me is appreciated!
Scott
"WingCommander" wrote:
I have requested a new updated PIX this morning. Just FYI the tech's.
response the morning (before my replacement request) was:
As per my understanding the internal DNS gets
oversubscribed/overloaded due to which it no longer entertains DNS
requests from internal clients. We verified this by changing the DNS
server to 4.2.2.2 on another machine which after which it was able to go
online.
Clearing the connection (w.r.t internal server) on the PIX
offloads a lot of connections from the server after which it is able to
entertain DNS requests.
I believe that we have narrowed down the issue not to be with the
PIX. Please let me know your thoughts in this respect and if i can be of
any further assistance on this case regarding the PIX
"Cris Hanna [SBS - MVP]" wrote:
based on a quick google search...this is clearly a pix issue.
I'd make sure the PIX has the latest firmware and OS running.
--
Cris Hanna [SBS - MVP]
Co-Contributor, Windows Small Business Server 2008 Unleashed
http://www.amazon.com/Windows-Small-Business-Server-Unleashed/dp/0672329573/ref=pd_bbs_sr_1?ie=UTF8&s=books&qid=1217269967&sr=8-1
Owner, CPU Services, Belleville, IL
A Microsoft Registered Partner
------------------------------------
MVPs do not work for Microsoft
Please do not submit questions directly to me.
"WingCommander" <WingCommander@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message news:2166420F-F6B1-4CE2-90E5-29B17C5A7967@xxxxxxxxxxxxxxxx
Cris, thanks for you help so far. I have called my ISP out and the tech
should be here this morning. One of the troubleshooting steps the Cisco tech
recommended was once the PIX stopped passing traffice, to run the command
"clear xlate local 192.xxx.xxx.xxx", with that IP address being my SBS
server, which again is also my DNS server. I was finally able to do that
this morning, and when I did the internet connectivity was restored.
Any ideas whey, or what that command does? Sorry about asking you, but it
is VERY hard to understand what the tech is telling me.
"Cris Hanna [SBS - MVP]" wrote:
> The cisco tech would be wrong then regarding the DNS server as all they handle is internal DNS and forward requests for external sites to external DNS
>
> If simply rebooting the cisco box resolves the issue, my inclination would be low signal strength from the provider.
>
> I just went through this with Charter Cable Business connection. Was having to reboot the Charter box daily or more.
>
> It was definitely a line signal issue, they ran new cable from from their junction in my back yard to the house and did a rebalance in the neighborhood. Been fine eversince.
>
> --
> Cris Hanna [SBS - MVP]
> Co-Contributor, Windows Small Business Server 2008 Unleashed
> http://www.amazon.com/Windows-Small-Business-Server-Unleashed/dp/0672329573/ref=pd_bbs_sr_1?ie=UTF8&s=books&qid=1217269967&sr=8-1
> Owner, CPU Services, Belleville, IL
> A Microsoft Registered Partner
> ------------------------------------
> MVPs do not work for Microsoft
> Please do not submit questions directly to me.
>
> "WingCommander" <WingCommander@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message news:239D5D0B-6F53-40B0-987B-91852DE49498@xxxxxxxxxxxxxxxx
> No i am not hosting a public website, or public DNS. My primary and
> secondary DNS servers are of course settings provided by my ISP.
>
> "Cris Hanna [SBS - MVP]" wrote:
>
> > You are not hosting public website and public DNS server on your SBS server are you?
> >
> > --
> > Cris Hanna [SBS - MVP]
> > Co-Contributor, Windows Small Business Server 2008 Unleashed
> > http://www.amazon.com/Windows-Small-Business-Server-Unleashed/dp/0672329573/ref=pd_bbs_sr_1?ie=UTF8&s=books&qid=1217269967&sr=8-1
> > Owner, CPU Services, Belleville, IL
> > A Microsoft Registered Partner
> > ------------------------------------
> > MVPs do not work for Microsoft
> > Please do not submit questions directly to me.
> >
> > "WingCommander" <WingCommander@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message news:A3DD5447-F94D-4BD9-9A68-43DF8188D759@xxxxxxxxxxxxxxxx
> > Hello. For months I have been attempting to locate a problem that we
> > experience. It seems like every morning when we come in, the internet is
> > down. I have a PIX that I simply power cycle and everything works. We have
> > noticed that before the internet goes down we stop receiving external email
> > via our pop connector (yes I know that I need to get off of it, but first
> > things first.)
> >
> > After much troubleshooting with Cisco, the cisco tech believes that the
> > problem is that my internet DNS server that is running on my SBS DC is being
> > overload between DNS calls and Exchange email load. The problem that I have
> > with this explanation is that the PIX rarely fails during the day, and 90% of
> > the time it fails either at night or on the weekend.
> >
> > It does bear to mention that my DC has about 65 users on it, is 5 years old
> > and was spec'd for a much smaller company. I have moved all data shares to
> > other servers, so the only thing this SBS server is doing is basically SBS
> > functions.
> >
> > What I would like to know is the following:
> > 1.) Does the recommendation that the DC is overload with email serving and
> > DNS serving sound valid. (BTW, the CPU load during the last fail was only 5%)
> >
> > 2.) Is there anything I can do to lessen the load on either the Exchange
> > server, DNS server, or both?
> >
> > 3.) Any other recommendations that you might have?
> >
> > Thanks
> > Scott
> >
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