Nostalrius Begins - Quality wow vanilla realm (1.12)

Hello,

I'm not able to connect to the nostalrius wow server.
First of all I was able to login to my account, I was able to change the server (with horrible timedelays) and to connect to the PvP Realm "login to game server" - thats it.

After that I read several topics to solve the problem.

First of all the things which I did:

1.) Realm List set:
set realmlist login2.nostalrius.org
set realmlist login.nostalrius.org

I tested both.

2.) Open my Ports and IPs:

3479 (port), 178.33.122.86 (ip)
8089 (port), 5.196.82.39 (ip)

3.) perform WoW classic as admin

4.) Windows Firewall - manuell access for Wow Classic (that its not blocked).

5.) used ethernet cabel instead of Wifi (after that I was able to join the server and create a undead Priest called Heyset) - I had 21ms on the Wow classic realm.

after that I received a disconnect and from now I'm not able to join the server (after typing my accname and passwort) I get instandly a disconnect.

Can you help me guys?