An Hero

Wow. I really don't know what to do past that. Sorry I can't help anymore.

Woo-hoo, I solved I problem. (Actually not sarcasm)

Well, I don't know what you think linking me to the Technic Forums homepage would do but it certainly didn't emphasize your point. I can't tell you which part is important if I can't see the error log. Give me a pastebin link to it then I might be able to help. I'll skim through it and see whats going on. Your server file should have a file titled log or something similar, also try checking the log in your .techniclauncher folder.

Did you try deleting .techniclauncher and redownloading it? It might be necessary to download everything again before it starts running on 64bit Java 7.

Edit the post to include the OS, don't double post. Clearly your TechnicLauncher can't access the internet, make sure your firewall isn't blocking it and make sure an antivirus isn't blocking it.

Make sure your downloaded and installed Java 7 64bit rather than 32bit. When you have 32bit it gives less options to how much memory you can allocate.

Welp, that was very informative. Try telling us what these "certain tings" are then we might be able to help.

Is this on a server or SP? Somebody might be taking them out of your machines. Also is it all machines or just a few like macerators?

Are you sure the server didn't close while you were on it?

Check your .techniclauncher folder to see if anything is wrong in there. I've had problems with updates in Voltz before. Best thing to do is go into manual build selection and pick the build below the one it's currently using. If that doesn't restore the blocks then they might be lost forever.

Try deleting Netherores. That tends to be a problem with some servers.

Do other players on the server crash when they get near it? If not tell them to destroy the energy link and tubes. I've had some bad experiences with the tubes. Just get them destroyed, then try replacing them. If everyone crashes when near it then us MCedit.

What exactly are you expecting people to do without any form of information other than "they get stuck on logging in". Post the error log otherwise nobody can help.

That's a doublepost, you don't want to do that. Use the edit feature. I know you say it isn't the texturepack, but have you tried using the default texturepack.

Wow, jesus. Not to be a dickbag (A bag of dicks) or anything but I'm pretty sure you just (I don't know what it's called) posted 5 times. mmuziek, use the edit feature, copy the logs from pastebin into error logs rather than the link, and you can just edit the posts that only have a few messages in them. Not to be an asshole but you might want to read through the rules. If someone other than me sees your posts they'll probably report you, I'm just trying to be helpful here. Now onto actually fixing things. Close any non mandatory (fancy word for non-essential(fancy word for not needed)) programs. Those might be using up some memory so your tekkit can't allocate enough. And from what I can see it looks like your Technic Launcher is redownloading every mod every time you launch it? It could be that due to its constant redownloading of files your internet is slowing down. Also there's a bunch of Java errors going on in there that I don't understand. Try uninstalling Java 6. Your technic launcher is using Java 6 instead of seven. If none of these work and if nobody else posts here in a while try deleting .techniclauncher and downloading everything again, after you uninstall Java 6. Then make sure it's running on Java 7.