Thank mate, just connected now, all seems work now.
Edit : I found the error but I do not know where the problem originates.
Only in the Formula BMW server, other servers were not affected by this error.
Here is the log :
Feb 20 21:41:00 INSIM ERROR : WOULDBLOCK
Feb 20 21:41:12 FATAL INSIM ERROR : BUFFER SIZE
Feb 20 21:41:12 InSim closed : Airio
Thank you for the Info Nofreak