As per Sergey's query re: the DNS. Do you have a DNS server or are you using the router's DNS. also where is the SQL Server located, on the LAN or remotely.

>We are using a separate switch. Fiber comes into a little box (don't know if that is the router) then goes to firewall then to switch to which the different PCs connect.
>
>Thanks for the help.
>
>Alex
>
>>Are you using a separate switch or the router ports for the network.
>>
>>>For some reason when we lose internet connection SQL Server does not respond to connections from the LAN. Does somebody know how to correct this?
>>>
>>>TIA,
>>>
>>>Alex