Thanks to FC99 and KG26_Alpha.
The problem income when a player connect to the server with a nickname using a cyrillic font.
About the Dedicated Server usage, you can follow the link to have an idea of what we do with:
IL2 DS 4.12m + IL2 SC 2.03 + IL2 DCG 3.47.
http://cieldeguerre.servegame.org/
This is only possible because you given us your time and skill and we try to do our best with the results.