Nisch

This solution worked for me. First I located the problem to my router. Then I reseted it to fabric settings and voila! It works now again!

Try to connect directly to your modem and see if you can enter sixlaunchers website. If you can it is probably a problem with your router. A reset might fix it. Otherwise you can try dayzcommander which Jukez suggested earlier. I know it has worked for many.

I tried to reinstall, restart, run as admin and then a lot with dsn-servers, proxy. This morning, I connected my cable directly to the modem and not to the router. This actually worked. I can now enter the website, sixlauncher can update and I can play again. I guess there is something wrong with my router so I will bring it back to zero and start it all over again. Haven't done that yet but I guess it will fix my problem. I'll post again if I fix it completely

I have the exact same problem. Did you manage to solve it? Because I have tried a lot of different ways now and none worked.