@Sebastian-Roth

thank u very much, finaly the issue is resolved !!
thnx a lottttt

here is the apache log file
thnx.
0_1542789695829_error.log

good morning ;
after installation of fog server and testing 2 or 3 machine by imaging and cloning ,
this morning i try to open fog server but no chance : HTTP ERROR 500
trying to foolow the instructions of memebers in this link , by clearing the password of mysql
but no solution. link :
https://forums.fogproject.org/topic/11273/http-500-internal-server-error/2
so please if any one have an idea can help me.

thank you