what is the crossfire arx europe server? is it the official gamerage server?
Frankly speaking I don’t know. 
I’d added it but no idea what it was for. Did you try to test it while playing the game with Mudfish? I think you should check How do I know if its working? whether mudfish works for it or not.
MUDEC_00031 , MUDEC_00037 , MUDEC_00269
- Please turn off FastConnect
mode then change your Connection Protocol
thanks