This site can't be reached

When I am trying to access My login panel . erro message shown that this site can’t be reached in my panel. Recently I’m trying to Install ClamAv in my Centos 7 but I need to enabled to SELinux for that. When i rewrite the file to enabled by enforcing after that I can’t accessed by login panel. My SElinux is disabled still shows.

Dear we do not support cenost 7 anymore and a lot of packages also do not support so I will recommend you to shift on any update os