I hope that I understood what you mean exactly and got the right information.
yes, you are right. it is what i want.
The certificate does not match the key. To change them try 'tmsh modify sys httpd { ssl-certfile /etc/httpd/conf/ssl.crt/server.crt ssl-certkeyfile /etc/httpd/conf/ssl.key/server.key }'
it seems httpd's certificate and key do not match. can you correct it? and then re-load configuration (tmsh load sys config).
sol13349: Verifying SSL certificate and key pairs from the command line (11.x)
https://support.f5.com/kb/en-us/solutions/public/13000/300/sol13349.html
sol14620: Managing SSL certificates for BIG-IP systems using the Configuration utility
https://support.f5.com/kb/en-us/solutions/public/14000/600/sol14620.html