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What about firewalls?

By far, the biggest source of connectivity issues come from firewalls. Users either don't configure them properly or they are not optimised for a LAN Party environment. 99% of the time, if you have problems finding servers or sharing files, your firewall will be to blame. The staff do not have the time to properly configure every firewall so they usually disable it. This is relatively safe; we've never had anyone deliberately 'hack' another person's computer at our events. Even if anyone was to try, they would be within punching distance, so why would they take the risk?

Check out this tutorial on how to disable your firewall.