[ubuntu] Computer-to-computer communications on the local wifi network are blocked... why?

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http://ubuntuforums.org – Hi, I suspect this is not strictly an Ubuntu question, but I definitely see it on my Ubuntu machine and it's very likely that somebody here knows more about the problem than I do. I used to be able to communicate between machines that are connected to the same wifi router, e.g., I'm running a WebDAV service on my Linux machine and other computers and mobile devices could access it by IP in the past. Now, all such communication is blocked. I've tested multiple ports (80 for WebDAV, 57120 for Open Sound Control messages to and from SuperCollider) -- no successIt affects both TCP and UDPIt af (Hardware)