Apache shutdown unexpectedly. This may be due to a blocked port, missing dependencies, improper privileges, a crash, or a shutdown by another method

Apache shutdown unexpectedly. This may be due to a blocked port, missing dependencies, improper privileges, a crash, or a shutdown by another method.
How can I solve this problem?
I already chagned the cong=fig file “Listen port: 80 to 8800”
I also changed the “httpd-ssl.conf” file too

I want the proper solution of it.
Please help me