I have this problem also have been running tekkit servers for a while until I kept getting errors saying I can't connect to Minecraft.net when I can. I then reinstalled technic launcher (full while of .techiniclauncher and of the exe) This has stopped the connection error but now I cannot join my own server while others can due to supposedly not having minecraft forge.
Any suggestions? I tried to restore my old technic folder but cot the connection errors again!