SBS 2008 clients connectivity issues

I have a client that has 1 SBS 2008 server and approx 12 client PC's. mostly XP OS, and 3 Win 7 boxes, all AD, Exchange 2007, Sharepoint, standard SBS 2008 Server setup.

Server IS doing DHCP and DNS, as well as other roles. Linksys Router WGRT52, Netgear 16 port switch, internet via cat-5 cable coming from TW Telecom Adtran device, (all is 100% with this box from the tech.  All ok with all users until a day or so ago, all of a sudden, 8 users got limited connectivity on their internet connection,  No Outlook, NO internet, (all they normally do, and access to 2 share drives). Server, and another user connected to another 5 port switch working just fine, Server line is plugged into router, another 2 users connected same way, NO IP, limited connection, no internet, etc. Also 2 other sets of 2 users, connected by switch then connected to main switch (basically have 4 2 user PC offices connected to local 5 port switch, then connected back to main switch)

Checked ALL server services, rebooted several times, users still won't come up. REPLACED both main switch and Router with NEW equipment, and configured Router with Static IP info. All Cat-5 lines plugged directly to Switch, then router plugged to switch main port/autosensing port. If I connect the Cat-5 line directly to Router via internal 4 port switch, some of the 6 stations work, get IP's, get internet and Outlook, if I plug back to switch, it looses the IP and gets limited connection. Happens with existing Switch and router or replacement NEW equipment. If I take my outside domain laptop and plug into the switch directly, i cannot get an IP either, limited connection. If I go straight to router port, I can get online

All 3 5 port switches either fairly new, or I use my  laptop connected to main Cat-5 line (bypassing switch) and I get Limited Connectivity, NO IP, no Internet, etc

I'm at my wits end ! all new hardware, ISP internet box 100%, ALL services running on Server..

All I see in the Event logs are DistributedCOm errors, but I do not know what they are.

 The application-specific permission settings do not grant Local Activation permission for the COM Server application with CLSID
{61738644-F196-11D0-9953-00C04FD919C1}
 to the user NT AUTHORITY\NETWORK SERVICE SID (S-1-5-20) from address LocalHost (Using LRPC). This security permission can be modified using the Component Services administrative tool.

ALL help is most appreaciated, I have looked at this for many hours now, and the Client is frustrated..

Kevin CaldwellOwner of RUseeingRed Tech SolutionsAsked:
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Kevin CaldwellConnect With a Mentor Owner of RUseeingRed Tech SolutionsAuthor Commented:
What I finally ended up doing was buying another router and switch, installing and configuring the router from scratch with the parameters from the old router
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ccnsCommented:
have you checked the DHCP on the server, making sure that there is not also DHCP on the router/firewall.
otehr thing could be try replacing the switch with 1 switch for all users, and if again if you have one swapping out the router/firewall. to test.
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ccnsCommented:
also check cables that are connecting to each switch and router. possible they had a power failure overnight and somthing got fried.
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linrafCommented:
Your description is very confusing, but it sounds like you have one of the following:
A DHCP server conflict - i.e. dhcp is being handed out by router and server ( turn off on router, make sure service is still started on server)
A network loop- 2 paths to the same device.

Please check for those items.




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linrafCommented:
Sorry, my answers are duplicates of the 2 above, I didn't show any answers when I started typing.
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Kevin CaldwellOwner of RUseeingRed Tech SolutionsAuthor Commented:
I tried to be as clear as possible,, DHCP is running on the server, NOT in the router, it is turned OFF there.. I have checked the cables going to each switch in the offices, and have gone straight from the cat 5 cable that feeds them to my laptop, and limited connection is what I get... Everyone except the server is plugged into the switch, the server is plugged into the router, but is I go thru the switch, I ALSO get limited connectivity, and NO IP address..

A User told me he was fine on the internet, early in the morning, say 9 am, then around 11:30 his just "stopped", and since the other office user was joined by a switch, she stopped too.

Picture 4 offices, each with 2 PC setups, on a switch, with the cat 5 feed going back to a server room into a main switch, the router plugged between them, the Server is in one of those offices with another user, and they have a switch, and since they are in the main router, they work, when plugged into the main switch, where they should be, they do not work...I cannot get an IP.
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Kevin CaldwellOwner of RUseeingRed Tech SolutionsAuthor Commented:
No one had the right answer, and I stopped getting comments on the question. Replacing the equipment solved it.
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