Apache service goes down frequently on a Plesk for Linux Server: AH00484: server

[Suhitha]

Question: Apache service goes down frequently on a Plesk for Linux Server: AH00484: server reached MaxRequestWorkers setting


Symptoms

• Apache constantly goes down with the error below:

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server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers setting

• At the same time the MaxRequestWorkers value was increased but this does not solve the problem.

• There is high number of CLOSE_WAIT Apache connections on the server as on the following example:

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# netstat -tanp | grep httpd | awk '{print $6}' | sort | uniq -c | sort -n
..................
1700 CLOSE_WAIT

• In an attempt to strace any of the CLOSE_WAIT connection processes only one domain, example.com is shown.

• Websites can be inaccessible with the error below in domain log file:

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(70007)The timeout specified has expired

Cause

Issue with a website code causing high CLOSE_WAIT connections.


Resolution

1.Log into Plesk.

2.Suspend the domain example.com.

3.Restart Apache and PHP handler that is used for example.com domain via Tools & Settings > Services Management.


Then and before enabling the domain again it is required to review the website code with its Developer or in case example.com is a WordPress instance, try to disable the plugins one by one until the culprit of this behavior is found.


Related to

Apache
Plesk for Linux