Login failed for user 'IIS APPPOOL\ASP.NET v4.0'

Question

I have a web project (C# Asp.Net, EF 4, MS SQL 2008 and IIS 7) and I need to migrate it to IIS 7 locally (at the moment works fine with CASSINI).

Locally in IIS I ha

Answer 1

In DefaultAppPool set NetworkService in the Identity property and in Sql Server add User Network Service and give it the appropiate permissions to your database, that's work very well for me, I've tested locally but I think this is the best configuration for connecting from any other computer in the network. when you set LocalSystem in the Identity in IIS that's work well and it is not necessary to create any other user in Sql Server but I think that will not work in a network environment.

Answer 2

Setting the identity only makes this work in my pages.

Answer 3

Have you done what @Teddy recommended and you STILL get the same error?

Make sure you're changing the settings for the app pool that corresponds to your virtual directory and not the parent server. Each virtual directory has its own AppPool and doesn't inherit.

Answer 4

Don't use Integrated Security. Use User Id=yourUser; pwd=yourPwd;

This solves the problem.

Answer 5

I used SQL Server Profiler (available in SSMS => Tools menu) and saw there (when IIS attempted to connect to database) that my IIS user was for some reason NT AUTHORITY\IUSR, no matter of all steps recommended in answers in this question. So I added that user to SQL Server, and it worked...

Answer 6

I had this issue and it was actually caused by something different - I had the 'IIS APPPOOL\ASP.NET v4.0' user in my database but it still wasn't working.

I had recently upgraded my SQL Server Install and in the process the User had become disconnected from the Login - so there was an 'IIS APPPOOL\ASP.NET v4.0' under Database -> Security -> Users BUT no User not under Security -> Logins.

Added the Login 'IIS APPPOOL\ASP.NET v4.0' to Security -> Logins, SQL Server automatically mapped it to the User in the database (this used to have to be done manually) and problem fixed.