Article ID: 118465, created on Nov 6, 2013, last review on Jul 24, 2014

  • Applies to:
  • Operations Automation 5.4

Question

A customer or Provider staff member cannot log into POA Control Panel, the following error message is displayed in browser:

Service Unavailable. The corresponding service is not available at the moment, try it within 2-3 minutes.

Cause

There may be several reasons of the problem:

  1. The maximum number of request processing threads to be created by the Apache Tomcat's HTTPConnector has been exceeded. In this case the following entries may be found in the /var/log/catalina.out file on the POA User Interface (UI) server:

    Oct 9, 2013 2:56:06 PM org.apache.tomcat.util.threads.ThreadPool logFull
    SEVERE: All threads (200) are currently busy, waiting. Increase maxThreads (200) or check the servlet status
    

    Linux does not have the separate threads per process limit, just a limit on the total number of processes on the system (threads are essentially just processes with a shared address space on Linux) which you can find using the following command:

    # cat /proc/sys/kernel/threads-max
    
  2. POA Task Manager works slowly due to many pending tasks and as a result requests from the UI server time out (Control Panel requests POA Task Manager to provide list of pending tasks for customer's subscription(s) when logging into POA CP).

Resolution

  1. Increase the number of threads in the system by the following command on the POA UI server:

    # echo new_value > /proc/sys/kernel/threads-max
    
  2. Upgrade to POA 5.5.

Search Words

All threads (200) are currently busy, waiting. Increase maxThreads (200) or check the servlet status

Service Unavailable. The corresponding service is not available at the moment, try it within 2-3 minutes

fatal error domain remove

unforseen error

ID de Error: 1375902823670

ac82ce33439a9c1feec4ff4f2f638899 caea8340e2d186a540518d08602aa065 5356b422f65bdad1c3e9edca5d74a1ae 2554725ed606193dd9bbce21365bed4e e12cea1d47a3125d335d68e6d4e15e07

Email subscription for changes to this article
Save as PDF