System.Web.HttpException: Request timed out. – Installing Sitecore CMS 7.1 rev....
source link: https://blog.coates.dk/2014/12/02/system-web-httpexception-request-timed-out-installing-sitecore-cms-7-1-rev-130926-update-package/
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System.Web.HttpException: Request timed out. – Installing Sitecore CMS 7.1 rev. 130926 Update Package
Whilst upgrading a solution from 7.0 to 7.1 in pre-production I got the following timeout exception.
Of course the first thing I did was set the timeout value of the httpRuntime to a massive number in the hope that this would fix the issue., but it didn’t 
<httpRuntime maxRequestLength="512000" executionTimeout="6000000" enableKernelOutputCache="false" />The problem is with IIS application pool setting “Ping Maximum Response Time” which is the time in seconds the worker process is given to respond to health monitoring ping. After 5 missed responses the work process is timed out and causes the afore mentioned exception
There are 2 solutions:
- Set ping enabled to false
- Set the Ping Maximum Response Time (seconds) to a large value
Of course remember to reset these values after you have upgraded.
I have to give the credit and say thanks to Marina from Sitecore support, as Marina identified this issue 
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