Unable to add git repository: Error occurred during /usr/bin/base64 command

Symptoms

• Unable to create git repository in Domains > example.com > Git > Add repository;

• Cannot open Git menu under Domains > example.com > Git:

  PLESK_ERROR: Server Error
  500
  Type PleskUtilException
  Message filemng failed: filemng: Error occurred during /usr/bin/base64 command.
  File Agent.php
  Line 228

• Unable to create a subdomain under Domains > Add Subdomain:

  PLESK_ERROR: PleskUtilException: filemng failed: filemng: Error occurred during /usr/bin/base64 command. (Agent.php:228)

Cause

Incorrect permissions for the .ssh directory and/or files inside it. Files should be owned by subscription user and group psacln.

Resolution

1. Connect to the server via SSH.

2. Determine the system user for subscription using the path to the vhost (see error from /var/log/plesk/panel.log for reference):

   # grep example.com /etc/passwd
   johndoe:x:10000:1003::/var/www/vhosts/example.com/:/bin/false

3. Set the system user as owner for all files of the .ssh directory inside virtual host:

   # chown -R johndoe:psacln /var/www/vhosts/example.com/.ssh/