Use the canonical IP address of the location your are visiting. It's not a 100% solution, but it often works when DNS is crapped out.
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What exactly are you trying to access, and how has the school blocked your access? L
. In WinXP: . Control Panel:Network Connections:<your connection>:Properties:TCP/IP:Properties:DNS Addresses. Put in DNS addresses that work for you. . . Or type in the IP addresses directly - a DNS is not required.