I have screwturn installed it uses app pool .net 2. Can I switch to .NET 4 without danger ?
For every application pool you create, the Identity property of the new application pool is set to ApplicationPoolIdentity by default. The IIS Admin Process (WAS) will create a virtual account with the name of the new application pool and run the application pool's worker processes under this account by default.
Application pools in Internet Information Services (IIS) is a mechanism designed to comprise a group of web applications corresponding to one or more worker processes (w3wp.exe) sharing a common configuration.
This should help: How to: Upgrade an ASP.NET Web Application to ASP.NET 4. You shouldn't have any issues. Personally I'd try it in a local or test environment first.
No, basically. When I last changed from 2.0 to 4.0 on an app-pool, we needed subtle but critical changes to configuration files (in particular), but ultimately any part of the runtime could have feature changes that break existing code on some edge cases.
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