Nginx error

nginx: [emerg] bind() to 68.168.98.181:443 failed (99: Cannot assign requested address)
nginx: configuration file /etc/nginx/nginx.conf test failed

You can disable nginx which should force the configuration to rebuild:

/usr/local/psa/admin/bin/nginxmgr -d

You can also try the steps below:

http://kb.sp.parallels.com/en/114245

If you get the error:

Apache config (14180811290.93120100) generation failed: Template_Exception: nginx: [emerg] bind() to 68.168.98.181:80 failed (99: Cannot assign requested address)

Re-read the IP’s in plesk. Then try again.