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SBS-replaced NICs->http client problems

By Ondrej Stanek ·
circumstances:I replaced both nic (cards) and changed internal IP, the replacement was made by adding two additional NICs to server,reconfiguring the server and finaly removed old 2 NICs, all the changes has been made by wizards - IP change, Internet connection change. then I checked in "Routing and Remote access manager" and at the level of "network connections". Everything seems to be allright.

problematic behavior: sbs clients/users running web-explorer cannot access most of http servers on internet. Really strange is that they can just browse + other 3-site and that is all.
NAT at the server seems to be working fine because appl. clients like skype, icq, ftp works fine.
I have thought that's the problem of DNS server (sbs) , but it answers correctly all my queries made by nslookup from the client station. I suppose that web clients/ sbs users are not able to browse those sites which are placed on the web servers hosting many domains.

Where could be the problem ?

server solution: SBS 2003 standard version, 2 nics with static IP, DHCP server disabled, clients use DNS of my SBS server

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