Why is the proxy server to access the Internet work, but the rest of the network does not work?

Setup: a computer running as a server, the ADSL line running through a USB with 4 others in a network through an 8-port switch Linksys EZXS88W. The proxy server (for Internet connections) I'm staying active, and works of all teams. Each system can not see each other, or ping each other. However, the proxy server is working well. Running an XP Media Center, the latest versions and all patches. I had to activate the SQL Server database from a network, when all problems began.

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Performing a test with PL/SQL function in Active-Base SQL proxy

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