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

Refers to:

  • Plesk 10.0.0 for Windows
  • Plesk 11.0 for Windows
  • Plesk 11.0 for Linux
  • Plesk 11.5 for Windows
  • Plesk 12.0 for Linux

Created:

2016-11-16 13:06:13 UTC

Modified:

2016-12-21 19:57:41 UTC

0

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

Symptoms

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

Plesk installed inside Virtuozzo container.

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

Cause

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

Resolution

  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
  1. If the limit is almost reached, increase it:

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

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