SBS 2008 shows client PCs as Offline

Hi Experts...

I look after a SBS 2008 and I have the following networking symptoms.

- The server shows the clients as offline when they are not.
- I cannot log in with a newly created user
- I cannot browse to see the server from the clients
- I cannot Ping the Client PCs
- I have a SQL Based Application that cant seem to resolve the server path
- Remote desktop from offsite cannot be connected.

As far as I know, the only change I have made is to uninstall an older version of Kaspersky Endpoint protection and installed Kaspersky Administration server. I'm not sure there was a problem before this or not.

Another change that was made about 6 weeks ago was a new modem router was put in place and was made to be the DHCP server with this turned off in the SBS. Again, I'm not sure these problems where evident at that time.
Any suggestions?
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Mal OsborneAlpha GeekCommented:
I suspect you have the new DHCP server configuring your client machines with an incorrect DNS server. I would probably disable DHCP on the router and continue to use the SBS box, however the router's DHCP should be OK provided it is configured to give clients the SBS boxes IP for DNS.

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David AtkinTechnical DirectorCommented:
I would agree about the comments on the DHCP Server, the SBS wants to be in control of that.  Do this first.

It sounds like it could be your Kaspersky.  Temporarily disable it on one of the machines and then re-test to confirm.
MXDEWDAuthor Commented:
Thanks Malmensa, sorry about the delay in getting back asd I haven't been back on site for a bit.

I have changed the DNS server as you mentioned but what I also forgot to say is that the server IP address was changed when the new router was install and DHCP was moved.

Another thing that seemed to be an issue was that the NIC was unresponsive and any time I tried to access the Network and sharing center, it would crash explorer.exe. Deleting and reinstalling the adapter seems to have got things working again. I changed the DHCP back to the server, re-ran the SDBS Internet connection wizard and all seems good now.

There were a few DNS errors in the logs relating to the old IP stack so I have removed those as well.

I have don't this all in a test environment so will take it back to site and finish off testing and see how it goes.

Anyway, thanks for pointing me in the right direction :)
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