[ubuntu] Pidgin won't connect to jabber from my house

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http://ubuntuforums.org – I'm not sure if this is an ubuntu problem or if there's something wrong with my home internet connection, but it's a strange general-purpose networking question. The basic problem is that Pidgin won't connect to Jabber (either google talk or private jabber servers) when I'm connected to my home network. It works when I'm at work, and it works on my windows machine at home. But for some reason linux+wifi at my house kills jabber only. I know it's a weird problem, but does anyone have any ideas? (Hardware)