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When ever I try to login to a FTB server it says:

Connection Lost: Address family not supported by protocol family: connect: java.net.SocketException: Address family not supported by protocol family: connect.

What does this mean and how do I fix it?

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3  
what address are you putting in for the server? –  TZHX Jun 15 '13 at 8:37
    
Ensure that you are on the same version and also, as TZHX asked, what address are you using? –  ReallyGoodPie Jun 15 '13 at 13:41
    
Well When I load up the consle and lancher in the consle it says the same exact thing about 15 times –  Aidan Jun 17 '13 at 0:09
    
Also, did you try putting the message into search engines, find this post, and see if that was the problem & solution before posting? If not, does that fix it? –  SevenSidedDie Jul 25 '13 at 20:33

2 Answers 2

It looks like a Java problem. Try uninstalling Java and re-installing Java again.

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This SO answer suggests Java7 may try some (defunct?) IPv6-stuff, which you can apparently disable by adding the switch -Djava.net.preferIPv4Stack=true to your java -jar minecraft.jar call; or more permanently and easier by running the line setx _JAVA_OPTIONS -Djava.net.preferIPv4Stack=true from a command prompt. I do of course assume you already made sure your antivirus is not to blame...

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