Minecraft 1.6.2 lan connection help?

i have 3 computers and 2 can connect in a minecraft lan world just fine. on the one thats not working when i open a lan world the other cant detect it. when the other 2 open a lan world it can detect it but server times out. the other 2 can host and connect just fine. how can i find out what is interfering with my... show more i have 3 computers and 2 can connect in a minecraft lan world just fine. on the one thats not working when i open a lan world the other cant detect it. when the other 2 open a lan world it can detect it but server times out. the other 2 can host and connect just fine. how can i find out what is interfering with my connection on the one computer that is not working? is there a program or something that will tell me what is blocking the connection?
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