secure connection failed

I have VS with port 443 https , pool 80 , client ssl and everything is working fine. 

i have changed the pool to 443 so the new configration is : 

VS port 44, pool 443, client ssl , server ssl ( i have used the built in ssl " serverssl_insecure_compatible", i faced secure connection failed .. i have changed the  server ssl profile with the same certificate of client, but again the same issue.

i have server bypass f5, i tried to access the backend server with ssl (https) and it is working fine, so what might be the issue and how to troubleshoot it ?