Following error occurs on nginx restart, if the A Record of a Domain (sites-enabled) points to another IP as nginx is running on.
Nginx Host IP: 184.108.40.206
Domain IP (A Record) changed to: 220.127.116.11
nginx configtest (see nginx documentation / full command depends on host os)
Testing nginx configuration: the configuration file /etc/nginx/nginx.conf syntax is
ok[emerg]: bind() to 18.104.22.168:80 failed (99: Cannot assign requested address)
configuration file /etc/nginx/nginx.conf test failed
Remove linked Host Configuration File for related Domain and start nginx as usual.