Error retrieving Plesk license: Server Error 502 Bad Gateway

Symptoms 

• Unable to retrieve Plesk license keys, returning the following error:

  PLESK_INFO: Server Error 
  502 
  Bad Gateway

• Trying to retrieve the keys through command line the following error is returned:

  # plesk bin license --retrieve
  Updating Plesk license key: signal: segmentation fault

• Nothing is resgistered in /var/log/plesk/plesk.log file

• The following can be seen in the /var/log/sw-cp-server/sw-engine.log  file:

  CONFIG_TEXT: DEBUG: pid 19971, fpm_got_signal(), line 76: received SIGCHLD
  WARNING: pid 19971, fpm_children_bury(), line 252: [pool plesk] child 26855 exited on signal 11 (SIGSEGV) after 3.011048 seconds from start
  NOTICE: pid 19971, fpm_children_make(), line 421: [pool plesk] child 26994 started
  DEBUG: pid 19971, fpm_event_loop(), line 419: event module triggered 1 events
  DEBUG: pid 19971, fpm_pctl_perform_idle_server_maintenance(), line 363: [pool plesk] currently 0 active children, 1 spare children

Cause

The issue is caused by a bug in the product with ID #PPPM-10811 and/or #PPPM-11101, which will be fixed in upcoming Plesk updates.

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Resolution

No workaround is available.

Contact with Plesk support team.