Please help: Sites refusing connection

Hi,

Everything was working fine until I tried to install php curl.

I followed instructions on stack overflow and entered these commands:

apt remove -y libcurl4
apt install -y libcurl4 curl

Then all my sites refused to connect.

I removed libcurl4 curl, still no luck.

I removed and reinstalled PHP, still no luck.

I restored my Linode to a backup, still no luck.

I am out of ideas and it is fairly urgent that I get these sites back live. Please help.