I have the same Problem and I am on a mac 
it is very annoying I have a server but I cant play on it. Please help me fix it.
it is very annoying I have a server but I cant play on it. Please help me fix it.Login failed due IOException
- Thread starter krendar
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I have Kaspersky anti virus, i just disabled the antivirus in the general settings, applyed, clicked yes to confirm the disable, clicked launch, and it launched fine and it works, and yes i had this error until i did this.
"Disable your Anti Virus"
i have been having an ioexception problem with my feed the beast launcher on my desktop (it is linux) i have a laptop running same version of linux and i have no ioexception problems i have been having the problem for about 1 and a half months
edit i also have now tested the vanilla launcher and it isn't downloading the normal minecraft files and it says can't connect to minecraft.net
edit i also have now tested the vanilla launcher and it isn't downloading the normal minecraft files and it says can't connect to minecraft.net
I find the solution for this problem!
I get this IOExpection error for about a month or so, BUT ONLY UNDER WINDOWS! (I have WinXP.)
But not only the FTB launcer, nor the old vanilla or the new vanilla launcher don't want to work.
I try the jar and the exe launcers too under windows, both not worked.
I mostly use Linux, and there, I dont't get the IOExpection WITH THE SAME LAUNCER.
I don't understand how it could be, but really doesn't care about it. Because I can play under Linux.
But for now, I must stay under Windows for a while, so now I start to looking around what cause this problem.
The solution is SO SIMPLE!
When I look through all my windows programs, drivers, etc. I realized there is an update for JAVA.
After the update, all the launcers start to work, the IOExpection error was gone!
SO THE SOLUTION IS: UPDATE YOR JAVA!
(Maybe thats cause the problem for most of the peole.)
I get this IOExpection error for about a month or so, BUT ONLY UNDER WINDOWS! (I have WinXP.)
But not only the FTB launcer, nor the old vanilla or the new vanilla launcher don't want to work.
I try the jar and the exe launcers too under windows, both not worked.
I mostly use Linux, and there, I dont't get the IOExpection WITH THE SAME LAUNCER.
I don't understand how it could be, but really doesn't care about it. Because I can play under Linux.
But for now, I must stay under Windows for a while, so now I start to looking around what cause this problem.
The solution is SO SIMPLE!
When I look through all my windows programs, drivers, etc. I realized there is an update for JAVA.
After the update, all the launcers start to work, the IOExpection error was gone!
SO THE SOLUTION IS: UPDATE YOR JAVA!
(Maybe thats cause the problem for most of the peole.)
IO Exceptions are often caused by issues with Java not getting a good connection. This could be due to outdated Java, security program blocking the launcher/Java, etc.
This is why I always suggest that users complete the troubleshooting guide I've written, as it covers most of the setup related issues.
Prior to posting a thread, or submitting a ticket, you should always ensure that your software is up to date.
Also, this issue was presented 6 months ago, in which case the circumstances of the error are likely extremely different.
This is why I always suggest that users complete the troubleshooting guide I've written, as it covers most of the setup related issues.
Prior to posting a thread, or submitting a ticket, you should always ensure that your software is up to date.
Also, this issue was presented 6 months ago, in which case the circumstances of the error are likely extremely different.
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