SBS 2011 Intermittent Connectivity

Hi all, complaints of the new year!

We are running SBS 2011 as out office server. Got 12 PC/Laptops connected to it.
SBS is fully patched and well looked after.
Installed on the SBS box too is an SQL database.

Past two weeks we have on our users pc "lost" connectivity - Exchange gets disconnected and the SQL throws ODBC errors. Some instances the shared folders dissappear and we can only view the redirected folder.

A couple of seconds later - all back to normal.

RDP connection to the server throws out a protocal error and disconnects.

I have:
Replaced the switches.
Replaced the netgear firewall.
Replaced the network card
Turned off Power management on the NIC.
Ran Fix Your network. (Complains that it couldn't configure router - but the relevant ports are opening and working)
No errors in event logs other then the ongoing "safe to ignore" ones.

Other then that everything working 100% - just we loose connection. I done seem to loose connectivity more often the more we load it. Like playing movies from the server etc.

What am missing??

Or send me in the right direction on some network tools?

Thanks
Sean
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SeanNijAsked:
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arrorynConnect With a Mentor Commented:
Is IPv6 active on the NIC? If it is, and it's not needed, then turn it off. That's been known to cause connectivity issues.
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Neil RussellTechnical Development LeadCommented:
Does it affect ALL machines at the same time?
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SeanNijAuthor Commented:
Nope.

Mostly the exchange gets disconnected same time BUT not all users. My laptop for example and one other collegues never seem to get disconnected from Exchange, but we do loose connection to the server.

One other thing: I often use the shutdown command in dos prompt to shutdown pc's left on or servers left on.

Oddly, the firstime i type shutdown /s /f /m \\geneserver it will sometime come back saying cannot connect / find blah blah, and if i immediatly type the command again it will 'see' the server and shutdown.
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SeanNijAuthor Commented:
IPV6 is need for exchange on the box surely?
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arrorynCommented:
IPv6 is certainly needed to complete the Exchange installation, but as far as I am aware it can be disabled in a working environment without any effects.

You made me question it though and I've done a couple of checks. It should be alright in a standard basic install.

http://social.technet.microsoft.com/Forums/en-US/exchange2010/thread/d0cade08-55e1-4748-be2b-7d5433b364ba

http://social.technet.microsoft.com/Forums/en/exchangesvradmin/thread/4459d006-2803-4f8c-b0af-f6b2cdadf7a4

I'd understand if the OP wanted to avoid though.
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SeanNijAuthor Commented:
Arroryn, thanks! I disabled it as suggested in one of the articles. I did renable it again afterwards and ran fix my network - which then picked up I was missing records from DNS.

Since then - all 100%
Thank you.
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