Plesk is not accessible after upgrade: "ssl_ciphers" directive is duplicate

Symptoms

• Unable to access Plesk after an upgrade.
• Attempt to restart sw-cp-server service results in error:

  # service sw-cp-server restart
  sw-cp-serverd: nginx: [emerg] "ssl_ciphers" directive is duplicate in /etc/sw-cp-server/conf.d/ssl.conf:1
  sw-cp-serverd: nginx: configuration file /etc/sw-cp-server/config test failed

• Previously, the article [Plesk] CVE-2015-4000 LOGJAM TLS DH vulnerability has been applied on Plesk installation.

Cause

This is a Plesk bug with ID PPPM-3228, which is fixed in Plesk 12.5.30 Update 1: 

Resolution

Upgrade to the latest Plesk version How to upgrade Plesk to the next release.

If upgrade is not possible, apply the workaround below:

Note: if direct SSH access to the server is not possible, contact server administrator for further assistance.

1. Connect to the server using SSH
2. Remove the file /etc/sw-cp-server/conf.d/ssl.conf and restart the service sw-cp-server :

   # rm -f /etc/sw-cp-server/conf.d/ssl.conf
   # service sw-cp-server restart