Retrieve keys hangs: License is in grace period even though it was updated

Symptoms

• License is in grace period even though it was updated:

  PLESK_WARN: Warning: You are currently operating within the grace period of your product license. To update your product license, select the Retrieve Keys option on the License Management page.

• While trying to retrieve/install keys at Plesk > Tools & Settings > License Management (Plesk > Tools & Settings > Server information) the page loads until it fails with 504 Error.

• After enabling debug, in /var/log/plesk/panel.log it can be seen that the license update stops on the following step:

  CONFIG_TEXT: DEBUG [util_exec] [5af1e640d2247] Starting: sysinfo df-full, stdin:

• The following df (disk free) can be found:

  # ps aux | grep df
  root 6806 0.0 0.0 18356 2012 ? S 06:46 0:00 /usr/local/psa/admin/bin/sysinfo df-full
  root 7229 0.0 0.1 18356 4416 ? S 06:48 0:00 /usr/local/psa/admin/bin/sysinfo df-full
  <..>
  root 11409 0.0 0.1 18356 4424 ? S 12:55 0:00 /usr/local/psa/admin/bin/sysinfo df-full
  root 13955 0.0 0.1 18356 4420 ? S 12:57 0:00 /usr/local/psa/admin/bin/sysinfo df-full

• df -h command hangs

Cause

df utility processes are hung and prevent the keys from retrieval and/or installing.

Resolution

Reboot the server and try retrieving the keys again.

Note: it is not recommended to kill the hung df processes.