http://pastebin.com/PZRyExG6

when i connect one server.
what's the problem?

Can you provide your FML log? There is not enough information about it in the log you posted

http://www.mediafire.com/download/gjc2m009xbxfeow/ForgeModLoader-client-0.log

What is the exact problem? Crash? Cant login to server? The small nullpointerexception in the log is not a BC issue

nothing, when i logging the minecraft freeze but about 3minute unfreeze and back in multiplayer menu!
In server console write this:
17:00:50 [INFO] Read timed out
17:00:50 [INFO] waxdes9703 [/xx.xx.xx.xx:xxxxx] lost connection

According to the log, i don't see how this is in any way related to BuildCraft.
Can you join other servers or singleplayer? Maybe it is an issue with something on the server.

could it be an issue with mojang? http://xpaw.ru/mcstatus/

They have been working on the servers all day which wouldn't help...

https://help.mojang.com/
There are indeed some problems with the authentication servers. I think that that is your problem.

singleplayer working

i making a new modpack, and i want to play that but i don'T D:

i have a new problem, kliens write this:
Failed to login: java.io.IOException: Server returned http response code: 503 for url
http://session.minecraft.net/game/joinserver.jps?user=waxdes9703... and a lot of number and letter

That is because the login servers are down. Wait until they're back up and all those errors will be fixed.

ok, many thanks for your help

don't open issue on random mods when its absolutely nothing to do with them