Ok, I did a research with a ID, and I saw something :
ALiVE SYS_DATA - ASYNC WRITE LOOP: SendJSONAsync ["POST", "events", "{""realTime"":""15/06/2015 13:46:17"",""Server"":""195.154.156.16"",""Group"":""82ndAD"",""Operation"":""82ND AD - Takistan Campaign"",""Map"":""takistan"",""gameTime"":""1034"",""Event"":""PlayerStart"",""PlayerSide"":""WEST"",""PlayerFaction"":""BLU_F"",""PlayerName"":""Joseph "Joe" Liebgott"",""PlayerType"":""B_Soldier_F"",""PlayerClass"":""Fusilier"",""PlayerRank"":""PRIVATE"",""Player"":""76561197991942302"",""GeoPos"":[5799.73,11223.6,0.00144196]}", "arma3live"] : BadRequest
I think, but i'm not sure, this player have this symbol in his name " (his name is Joseph "Joe" Liebgott), maybe the " is the problem ?