ISAPI 'C:\Windows\Microsoft.net\Framework\v.1.1.4322\asp net_isapi.dll' reported itself as unhealthy for the following reason: 'Deadlock detected'.

[Zubair.NET!]

In our web application we are calling different XML Webservices and
make approximately 25 calls every 10 minutes. We use a separate thread
to call a the webservice (Crawler) and populate our cache -- our
application then retrieves the data from the Cache -- the cache is set
to expire in approximately 25 minutes -- but since the Crawler
populates the cache every 10 minutes with the new data -- thus it never
expires.

In above scenario -- our webserver seems to stop responding after some
hours and we noticed that somehow requests to Webservices were piled-up
in IIS resulting in the delay and sometime 'Operation Timed out'.

we get the following error in the Event Viewer:

ISAPI 'C:\Windows\Microsoft.net\Framework\v.1.1.4322\asp net_isapi.dll'
reported itself as
unhealthy for the following reason: 'Deadlock detected'.

We referred to the following article and made appropriate changes in
the machine.config.
Contention, poor performance, and deadlocks when you make Web service
requests from ASP.NET applications
http://support.microsoft.com/?id=821268

However, our server still seem to timeout and waits for some requests
to the webservices to complete resulting in a delay or sometime 'Server
Timedout' errors, however after applying the above changes to
machine.config -- the application seems to recover from the delay after
sometime.

Please help us rectify the problem.

We'll appreciate your early response,

Thanks,

Zubair.NET!

[Peter Bromberg [C# MVP]]

Zubair,
It's difficult to tell from a newsgroup post what exactly is happening here.
However, I can make an educated guess that somehow your "separate Thread"
isn't being handled properly. If you can post some sample code illustrating
exactly how you are making these Webservice calls on a separate thread, you
will probably get more help.
Peter

--
Co-founder, Eggheadcafe.com developer portal:
http://www.eggheadcafe.com
UnBlog:
http://petesbloggerama.blogspot.com


"Zubair.NET!" wrote:

In our web application we are calling different XML Webservices and
make approximately 25 calls every 10 minutes. We use a separate thread
to call a the webservice (Crawler) and populate our cache -- our
application then retrieves the data from the Cache -- the cache is set
to expire in approximately 25 minutes -- but since the Crawler
populates the cache every 10 minutes with the new data -- thus it never
expires.

In above scenario -- our webserver seems to stop responding after some
hours and we noticed that somehow requests to Webservices were piled-up
in IIS resulting in the delay and sometime 'Operation Timed out'.

we get the following error in the Event Viewer:

ISAPI 'C:\Windows\Microsoft.net\Framework\v.1.1.4322\asp net_isapi.dll'
reported itself as
unhealthy for the following reason: 'Deadlock detected'.

We referred to the following article and made appropriate changes in
the machine.config.
Contention, poor performance, and deadlocks when you make Web service
requests from ASP.NET applications
http://support.microsoft.com/?id=821268

However, our server still seem to timeout and waits for some requests
to the webservices to complete resulting in a delay or sometime 'Server
Timedout' errors, however after applying the above changes to
machine.config -- the application seems to recover from the delay after
sometime.

Please help us rectify the problem.

We'll appreciate your early response,

Thanks,

Zubair.NET!