Service Unavailable Error Message When You Browse a Web Site

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shabbir ( Go4Expert Founder )

Shabbir is a developer in the field of Applications, web as well as database designing and is devoted to the optimization and usability of the code. He maintains Programming forum and is a C++ addict.

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When you configure your IIS webserver and find the following message

Service Unavailable

Then the first solution to the above error is http://support.microsoft.com/default.aspx?id=823552 but if this does not solve the problem try doing the following stuff.

Open the IIS Manager, right click Web Sites and select properties:



Switch to the Service Tab



Check "Run WWW Service in IIS 5.0 Isolation Mode".

You will be asked for Restart of IIS. Click yes to restart IIS. If you are not asked just restart IIS.

[cowboy3398]

This solved my problem which occurred after installing VM Server. My question is what does isolation mode really do and why did it fix the problem?

[shabbir]

As suggested by Microsoft

Originally Posted by Microsoft

You can run IIS 6.0 in one of two modes: worker process isolation mode or IIS 5.0 isolation mode. Worker process isolation mode is the default mode, that is, the mode that the server runs in on a clean installation. You can use IIS 5.0 isolation mode to run applications developed for older versions of IIS that are determined to be incompatible with worker process isolation mode.

This means you will not be able to take advantage of worker process isolation and the other features of worker process isolation mode.

[kalees]

I am getting the service unavilable error in the interval of 3 to 6 months. the application is created using asp and oracle.
i can see the following error in the event log.

Error:

Application pool 'application name' is being automatically disabled due to a series of failures in the process(es) serving that application pool.

can anyone tell me where is the problem? my application side or iis6 server side?

[shabbir]

Can you clarify what you meant by 3 to 6 months.

[kalees]

Hi shabbir,

Thanks for the reply,

i was getting that error before 6 months. after that i am getting the same error now


Regards,
Kalees

[shabbir]

Understand and Diagnose an Application Pool Crash would be good place to start off.

[kalees]

Hi shabbir,

Thanks for the valuable reply,

According to that article, we have to install debugger for find out the error that will happen in the next time. I can understand, but my question is whether my application may cause this error or not? if it is so then i have to check my asp pages for infinite loop,syntax errors..etc.But it is a very standard application and running for more than 4 years without problems.
Please kindly guide me.

Regards,
Kalees

[shabbir]

The cause of the errors cannot be from the program. It just the problem from the installation or configuration point.

[kalees]

many thanks