# IT:AD:Infrastructure:IIS:Concepts:ApplicationPoolIdentity #



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* Beginning in IIS 7.5, the default identity for an application pool is `ApplicationPoolIdentity`.  
* It is a `Managed Service Account` (ie a *pseudo* identity) that you won't find in the local usrs of the computer.
* When a web application is created using Visual Studio, the `App_Data` folder is ***not**** automatically configured to allow write access for `ApplicationPoolIdentity`.  Therefore the attempt to write to the `App_Data` folder will fail.


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## Process ##

Either create a unique AppPool identity and grant it rights, or stick with the `ApplicationPoolIdentity` and grant it rights to the App_Data folder: [[IT/AD/Infrastructure/IIS/HowTo/Provide/File/Access/to/ApplicationPoolIdentity]]


## Resources ##

* [http://support.microsoft.com/kb/2005172](http://support.microsoft.com/kb/2005172)