Probleme call of duty 4

Bonjour tous le monde je possède la version original de call of duty 4 sur pc.
Quand je veux creer un serveur dedier a internet pour jouer avec des amis une console s afiiche dans la console il est ecrit:

WARNING: unknown dvar 'bg_shock_volume_vehicle' in file 'shock/damage_mp.shock'
WARNING: unknown dvar 'bg_shock_volume_vehiclelimited' in file 'shock/damage_mp.shock'
WARNING: unknown dvar 'bg_shock_volume_menu' in file 'shock/damage_mp.shock'
WARNING: unknown dvar 'bg_shock_volume_body' in file 'shock/damage_mp.shock'
WARNING: unknown dvar 'bg_shock_volume_body2d' in file 'shock/damage_mp.shock'
WARNING: unknown dvar 'bg_shock_volume_reload' in file 'shock/damage_mp.shock'
WARNING: unknown dvar 'bg_shock_volume_reload2d' in file 'shock/damage_mp.shock'
WARNING: unknown dvar 'bg_shock_volume_item' in file 'shock/damage_mp.shock'
WARNING: unknown dvar 'bg_shock_volume_effects1' in file 'shock/damage_mp.shock'
WARNING: unknown dvar 'bg_shock_volume_effects2' in file 'shock/damage_mp.shock'
WARNING: unknown dvar 'bg_shock_volume_weapon' in file 'shock/damage_mp.shock'
WARNING: unknown dvar 'bg_shock_volume_weapon2d' in file 'shock/damage_mp.shock'
WARNING: unknown dvar 'bg_shock_volume_nonshock' in file 'shock/damage_mp.shock'
WARNING: unknown dvar 'bg_shock_volume_voice' in file 'shock/damage_mp.shock'
WARNING: unknown dvar 'bg_shock_volume_local' in file 'shock/damage_mp.shock'
WARNING: unknown dvar 'bg_shock_volume_local2' in file 'shock/damage_mp.shock'
WARNING: unknown dvar 'bg_shock_volume_ambient' in file 'shock/damage_mp.shock'
WARNING: unknown dvar 'bg_shock_volume_hurt' in file 'shock/damage_mp.shock'
WARNING: unknown dvar 'bg_shock_volume_player1' in file 'shock/damage_mp.shock'
WARNING: unknown dvar 'bg_shock_volume_player2' in file 'shock/damage_mp.shock'
WARNING: unknown dvar 'bg_shock_volume_music' in file 'shock/damage_mp.shock'
WARNING: unknown dvar 'bg_shock_volume_musicnopause' in file 'shock/damage_mp.shock'
WARNING: unknown dvar 'bg_shock_volume_mission' in file 'shock/damage_mp.shock'
WARNING: unknown dvar 'bg_shock_volume_announcer' in file 'shock/damage_mp.shock'
WARNING: unknown dvar 'bg_shock_volume_shellshock' in file 'shock/damage_mp.shock'
-----------------------------------
Working directory: D:\Programme files\Call of duty 4 Modern Warfare
Huffman Took 3 Milliseconds
Hitch warning: 9512 msec frame time
Resolving cod4master.activision.com
cod4master.activision.com resolved to 63.146.124.21:20810
Sending heartbeat to cod4master.activision.com
Resolving cod4master.activision.com
cod4master.activision.com resolved to 63.146.124.21:20800
Sending heartbeat to cod4master.activision.com
Hitch warning: 23964 msec frame time
Hitch warning: 5232 msec frame time
Sending heartbeat to cod4master.activision.com
Hitch warning: 540 msec frame time

Le probleme est que moi je peux me connecter dssus mes mais amis ne savent pas se connecter

Pourriez vous me dire comment resoudre ce probleme

MERCI D4AVANCE8