ARTICLE: What does the "unresponsive child" error message mean?

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Fri Apr 30 22:28:06 CEST 2021

** What does "unresponsive child" error message mean?
Like any system, FreeRADIUS provides error messages to inform administrators of problems within the FreeRADIUS server itself. Sometimes however, error messages that are logged by FreeRADIUS are actually reporting an indication that something is wrong with one of the connected systems. 

A common cause of some of these errors is an unexpectedly slow database.

The unresponsive child message is essentially a timeout error. It means that a request was sent to the database, and the database hasn’t responded within a set time limit.

Most database queries should happen instantaneously from the perspective of a human being, which means much less than one second. In contrast, the unresponsive child message is produced by FreeRADIUS after about 30 seconds! That is, FreeRADIUS is letting you know that it hasn’t heard back from the database in a very long time. This long time to respond indicates a major problem with the database.

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** What is the relationship between Network RADIUS and FreeRADIUS?
FreeRADIUS is an open source implementation of the RADIUS protocol and was written by Alan DeKok in 1999.

Network RADIUS is a private, for-profit company founded by Alan DeKok which provides commercial support for FreeRADIUS. The Network RADIUS team has been the primary contributor to FreeRADIUS for the last 20 years. The FreeRADIUS mailing list, wiki, and documentation are all moderated and maintained by the Network RADIUS team.

FreeRADIUS has always been, and will always continue to be, open source. The Network RADIUS team provides commercial support to paying clients, and free product development for the FreeRADIUS community at large.

All of our software development for FreeRADIUS is integrated into the Open Source platform, and will always continue to be.

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