[ubuntu] Cannot connect to one particular network on one particular machine using Ubuntu

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http://ubuntuforums.org – Hello, I'm experiencing a very strange issue: on one laptop I cannot connect to one particular network, only on Ubuntu. However, I can perfectly connect to other networks on this machine, I can connect without problems to this particular network on that same computer using Windows, and I can connect to this network using another machine with Ubuntu. To be correct: I can connect to the network (i.e. the tray icon shows I am connected with two out of three bars lighted), but any request times out. Firefox (and other browsers) show a time-out message, pinging times out, pinging the rout (Hardware)