If you get this error when restarting httpd on plesk linux servers:

"Address already in use: make sock: could not bind to address 0.0.0.0:443 no listening sockets available."

Actually the error says it all.

First, try to look for the processes that is listening to port 80 or 443. You can do this:

1. netstat -lnp grep '0.0.0.0:80'
2. lsof grep *:www
3. lsof -i:443
4. fuser -v 443/tcp
5. netstat -tulpen grep :443

After pointing out which uses the port, send a kill signal:

#kill -9 PID

Replace "PID" with the actual PID.

Hope that helps.

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