IIS ASP.Net Website - ManagedPipelineHandler

You are getting an execution timeout because the ASP.NET application hasn't returned back to IIS after the default timeout interval.

http://msdn.microsoft.com/en-us/library/e1f13641.aspx

This doesn't explain why it is taking so long. You could increase the default timeout of 110 seconds which might allow you to troubleshoot it better, other then that you should try to debug the code as the reason is not apparent in the ASP.NET sample posted.

To change the default specify the executionTimeout of httpRuntime in your web.config.

If you are connecting to a database to do the authentication you could look there and trace if and what is received.

The client had AVG Security workstation components installed on their servers. The workstation components caused communication issues with IIS. By disabling, Online Shield and Resident Shield the symptoms are no longer present.

Case Notes:

After two minutes of inactivity on any page on the web application, the page locks. You will see an Ajax loading panel ( aka spinning icon) for 120 seconds on your next action and then nothing. The application has locked.

To find out the root cause as to why we are getting the error "An operation was attempted on a nonexistent network connection. (0x800704cd)" when we browse any web page after an idle time of minutes. This issue can occur due to multiple reasons and for the purpose of this ticket we will concentrate on only one root cause If the issue is caused by a Microsoft component, we will work diligently and efficiently to resolve this issue. If the cause of the issue is identified to be a third party or custom component, we will be happy to discuss our findings in detail and provide possible methods of resolution/workaround. It will ultimately be up to the third party vendor to resolve these types of issues.

For troubleshooting, the default ASP.Net website was created and deployed as a new website to IIS. The results were the same as the problematic website.

IIS HTTP Errors:

start -> run -> LogFiles

2011-09-20 21:25:25 xx.xxx.xxx.xxx 36482 192.168.10.32 80 HTTP/1.1 POST /orders/mail/mailorderentry - - Timer_HeaderWait –

2011-09-20 21:22:29 xx.xxx.xxx.xxx 44399 192.168.10.32 80 HTTP/1.1 POST /orders/mail/mailorderentry - - Client_Reset –

At first, the issue apperared to be with Telrik. While loading up the Telerik.Web.UI.RadCompression on the REQUEST_ACQUIRE_STATE event, the following error was logged via IIS tracing:

Telerik.Web.UI.RadCompression 132187 ms

148. -GENERAL_READ_ENTITY_END BytesReceived 0 ErrorCode 2147943395 ErrorCode The I/O operation has been aborted because of either a thread exit or an application request. (0x800703e3) Informational

149. -GENERAL_FLUSH_RESPONSE_END BytesSent 0 ErrorCode 2147943629 ErrorCode An operation was attempted on a nonexistent network connection. 0x800704cd)

The RadCompression module was removed from the web application web.config file; however, the problem persisted.

Proposed Solution:

For now disable, AVG Online Shield and Resident Shield on the servers.

From AVG:

The following AVG components are designed only for a use on workstations:

• AVG Firewall
• AVG Online Shield
• AVG Personal E-mail Scanner
• AVG LinkScanner

The above components were not tested under a system load. If installed on a server operating system (such as ISA, proxy, mail server, terminal server, etc.) the components might cause issues with server communication. To avoid these issues it is not recommended to install the mentioned components on a server operating system. Note: This does not apply in case that you use the computer with some server operating system installed (e.g. Windows Server 2000, 2003 etc.) as a standard computer without the server features enabled.

More information about the AVG installation on specific servers can be found in these FAQs:

• FAQ 2129 - Terminal Server
• FAQ 2176 - E-mail Server