Server loses connection to network Intermittently

My client has a new PowerEdge T320. With VMWare 5.1 installed running Windows SBS 2011.  The problem is that all of a sudden the server seems to go offline.  Then within a couple of minutes it will come back online.  This will occur many times over the day.  When this happens the workstations, of course, cannot access any of the network resources including internet access.  However, there is internet to the workstations as I can still access them remotely via my Citrix.  

What I have already done:
- Switched ports on the back of the server
- New cable
- New switch
- Just downloaded some Windows updates to see if that will help

It does seem to occur when someone first logs on in the morning.  I can watch it all evening and no apparent issues, but as soon as someone comes in I can expect a call.  But at the same time it's not a defining thing  it's so random during the day.
mark-IT-2013Asked:
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mark-IT-2013Author Commented:
Hi All!

It seems it was a firewall issue.  I restarted the service and it worked
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Olaf De CeusterCommented:
Please run the SBS BPA versin 1.5 to exclude most common causes.
http://support.microsoft.com/kb/2673284
Hope that helps,
Olaf
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KwoofCommented:
Make sure your internal DNS is functioning properly...and your router.  I have seen both cause this type of issue.
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mark-IT-2013Author Commented:
So do you think the router could have the issue.  although, I can see all other computers online from my citrix console. Except the server when it does go off line
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KwoofCommented:
I have seen that in a router once...if the local clients can still see the server, but the outside connection through the router cannot, then the router needs a cold reboot, or sometimes a complete re-config...if it needs a full reconfig to work consistently, then I would replace it.
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WORKS2011Austin Tech CompanyCommented:
it could be a firmware upgrade needed on the router, have you checked this?

What type of router?
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Gajendra RathodSr. System AdministratorCommented:
It looks like IP conflict is network.

If any workstation or device has static IP address. Please check it not same as server.
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KwoofCommented:
Wow...I forgot about IP conflict...but it should never happen with a server...the DHCP range should never include the IPs used for servers, and servers should always have static IPs.
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WORKS2011Austin Tech CompanyCommented:
if there was an IP conflict a window would pop up and say so.

Run the "Internet Connection Wizard" and "Fix My Network" and post the results.

SBS loves the wizards especially after making all the manual changes you've made to the network.
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WORKS2011Austin Tech CompanyCommented:
If the router has uPNP turned on turn if off.
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mark-IT-2013Author Commented:
While trying different solutions given I found the firewall when turned off seemed to clear up the issue.  I restarted the firewall software and it seemed to work without issue.
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