Plesk is listening on port 6308 : sw-cp-server listens on port 6308

Symptoms

• sw-cp-server service is listening on port 6308:

  # netstat -tulpen | grep 6308
  tcp 0 0 0.0.0.0:6308 0.0.0.0:* LISTEN 0 12559953 32269/sw-cp-serverd

• File /etc/sw-cp-server/conf.d/apsc.conf is creating the socket for port 6308:

  # grep "listen" /etc/sw-cp-server/conf.d/apsc.conf
  listen 6308 ssl;

• There was Plesk upgrade from 11.5 to 12.0:

  # plesk db "select * from upgrade_history;"
  +---------------------+--------------+------------+-------------+------+
  | upgrade_date | version_info | db_version | os | mu |
  +---------------------+--------------+------------+-------------+------+
  | 2018-07-12 20:57:04 | 11.5.30 | 11.5.30 | NULL | NULL |
  | 2018-07-12 20:57:05 | 12.0.18 | 12.0.18 | NULL | NULL |
  | 2018-07-12 21:06:26 | 12.5.30 | NULL | Debian 7.11 | 76 |
  | 2018-07-12 21:12:49 | 17.5.3 | NULL | Debian 7.11 | 53 |
  +---------------------+--------------+------------+-------------+------+

Cause

This is a Plesk bug with ID PPPM-8949, which is planned to be fixed in one of the future product updates.

Resolution

As a workaround, perform the following steps:

1. Connect to the server via SSH:

2. Remove the configuration file:

   # rm /etc/sw-cp-server/conf.d/apsc.conf

3. Restart the Plesk service:

   # service sw-cp-server restart