Can’t access my file server from my LAN.

Hi all,
In my office, one computer is running Windows Server 2003. In my office, we have original license copy of Antivirus on all of the computers and Laptops. We randomly use file sharing from another computer.
For this, we configured a Linux server for file sharing. From all computers, we can use file from this Linux server. But from the Windows Server 2003 computer, we can not access Linux file server, but can access any other computer.
What’s the problem?
Thanks.
