Server Application Unavailable

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3/24/2008 11:02:47 AM
Total Posts 112

Server Application Unavailable

Hi All:

I started receiving:

Server Application Unavailable

The web application you are attempting to access on this web server is currently unavailable. Please hit the "Refresh" button in your web browser to retry your request.

Administrator Note: An error message detailing the cause of this specific request failure can be found in the application event log of the web server. Please review this log entry to discover what caused this error to occur.

with no Event Log entry. I found something here to (temporarily) fix the problem; I went to Internet Information Server (IIS) Manager, PC, Application Pools, DefaultAppPool and selected Recycle. In a few seconds we are functional again.

Does anyone else have any insight for a permanent solution?

Many thanks,
Dale E. Moore

3/24/2008 11:23:08 AM
Total Posts 18439

Re: Server Application Unavailable

Hi Dale,

In IIS (under Win 2003), if you right click the Default Application pool and choose properties, then click the Health tab, you'll see an item for "Enable rapid-fail protection". By default this is checked and the number of failures is 5 and the time interval is 5 minutes. What this means is if 5 errors occur within 5 minute it will stop the application pool. This will result in the Server Application Unavailable message.

I would uncheck that and periodically review the event log for errors to avoid having the app pool turned off as a result of errors.

There are lots of scripts trolling sites trying to raise errors and if they manage to cause 5 errors within 5 minutes it can result in a denial of service because it turns off the app pool if rapid fail is enabled.

Hope it helps,


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