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Are you actually on a network provided by the school? If you are then they're blocking ports/systems. The blocking is easy enough to do and they can disallow any connections they decide to, which explains why you can connect to the School's ftp and to no other ftp sites.
If that isn't the case, then it sounds to me as though the XP firewall is turned on. You'll need to call OptOnline support to see why your system can't make connections on certain ports/protocols.
When I get those types of errors, it is usually a problem with the firewall client not being able to find the proxy server, or a port is being blocked.
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+++++++++++Boom!
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