Login Failed For User 'Iis Apppool\Asp.Net V4.0'

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

Looks like it's failing trying to open a connection to SQL Server.

You need to add a login to SQL Server for IIS APPPOOL\ASP.NET v4.0 and grant permissions to the database.

In SSMS, under the server, expand Security, then right click Logins and select "New Login...".

In the New Login dialog, enter the app pool as the login name and click "OK".

You can then right click the login for the app pool, select Properties and select "User Mapping". Check the appropriate database, and the appropriate roles. I think you could just select db_datareader and db_datawriter, but I think you would still need to grant permissions to execute stored procedures if you do that through EF. You can check the details for the roles here.

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

You can add this user to your DB Logins by openning SQL Management Studio, Navigate to your database then open the Security then Logings and add new login and search for that user

Login failed for user IIS APPPOOL\WebExploit

If you executed the code you've posted as it is, you created the user in master database, not in your user database. So you should create it in user database and drop it from master.

So you need to execute the following code:

use PrincipalServerDB;
create user [IIS APPPOOL\WebExploit] from login [IIS APPPOOL\WebExploit];
EXEC sp_addrolemember 'db_owner', 'IIS APPPOOL\WebExploit';

Keep getting Login failed for user IIS APPPOOL\DefaultAppPool no matter what I do

In IIS Manager set DefaultAppPool identity as NetworkService. Although it works, you should try to make it work with AppPoolIdentity, since it the Windows 7 attempt to make it safer

Login failed for user 'IIS APPPOOL\myAppPoolName' and cannot add new user for this

By default, custom application pools receive the 'Network Service' user credentials.
Simply try adding a new login for your mssql server (and database, of course) for the 'Network Service' account.
Read more here

Exception when deploying to IIS: Login failed for user 'IIS APPPOOL\DefaultAppPool'

Solution found here:

• Open IIS
• double click your PC name under Connections
• Click Application Pools
• Select your app pool (DefaultAppPool)
• Then under actions on the right click Advanced Settings,
  
  • Go to Process Model section and
  • click on Identity.
  • Now select NetworkService.

Login failed for user 'IIS APPPOOL\ChatApplication'

The Application Pool Identity you created is not a Windows user.

Create a Windows user to use the selected value, or do not search but type the app pool identity yourself: IIS APPPOOL\ChatApplication.

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