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mod_mpmstats for IBM HTTP Server V2.0 and above provides better reporting of this condition; in particular, it can report when the Max Clients condition has been reached as often as once every 90 seconds.

The web server does not take any action when the Max Clients condition is reached.

I.e., all child processes/threads are already in use handling existing requests.

error validating proxy-88error validating proxy-61error validating proxy-58

A message with a similar cause in the http_is “as_handler: failed to create pool”.

At the time the message was written, there were not any worker threads, or child processes in V1.3, available to process additional requests.

A request has been issued from the browser, and that request maps to an actual directory on the web server machine under Document Root, and there is no active Directory Index directive/document to return a document such as option is not active for the directory so an error is returned.

To resolve the problem, you need to determine what response was supposed to be returned on this request.

In the latter case, for IHS 2.x and later, the path displayed stops at the directory name that could not be found.

If a request is intended for the Web Sphere Plugin, but isn’t handled due to an incomplete plugin-cfg.xml, you might see this message ending in one of your defined application context roots.

This type of tuning is described in the IBM HTTP Server Performance Tuning document.

As described in that information, the customer can get a good idea of how many of the IBM HTTP Server child processes/threads are in use at a given time by activating mod_status and checking the server-status page, or by monitoring with mod_mpmstats.

The default name for this Unix socket is [[email protected] /]$ ls -ld /usr drwxr-xr-x 63 bin bin 1536 Mar 7 /usr [[email protected] /]$ ls -ld /usr/IBMIHS drwxr-xr-x 22 root system 512 May 19 2004 /usr/IBMIHS [[email protected] /]$ ls -ld /usr/IBMIHS/logs drwx------ 2 root system 512 May 19 2004 /usr/IBMIHS/logs In this example, the IP address in next to last column is the IP address used by the client.

So you have to check if there is an SSL-enabled virtual host which specifies that IP address (or *) on the directive.

In many cases the condition will be corrected when a temporary application slow-down is resolved and threads, or child processes in V1.3, can finish their current requests and become free to handle new connections.

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