Article ID: 119200, created on Dec 17, 2013, last review on May 11, 2014

  • Applies to:
  • Plesk 11.0 for Windows


Site is not working, with "503 Service Unavailable" error.

Plesk installed inside Virtuozzo container.

Some random applications inside container could produce "access denied" errors.


Container's limit of processes was reached. Hence some random processes inside container were killed.


  1. Check current quantity of processes and limit of processes:

    Run command on hardware node:

    C:\>vzlist -o numproc,numproc.b <CTID>
         NPROC  NPROC.B
            75       80 
  2. If the limit is almost reached, increase it:

    C:\>vzctl set <CTID> --numproc 150
    Command 'set' is successfully finished
  3. Restart site application pool in IIS.

Search Words

access denied


503 Service Unavailable

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