I have an ASP NET APP that's trying to access a sql server database, when I run it, I get an error saying
"Login Failed for user IIS APPPOOL\DefaultAppPool"
Searching the web I found that I should grant access to this user, so I executed the following script:
grant execute on schema :: dbo to [IIS APPPOOL\DefaultAppPool]
It executed succesfully as a script for my database, but I still get the "Login Failed" error.
What's missing?
Check the user your DefaultAppPool is using to connect.
On your IIS manager check DefaultAppPool advanced properties and look for Identity. You need to give it a user with enough privileges, depending on what your site is going to do.
I usually create different AppPools for different sites depending on what they will do, for example, if your app will write documents to a folder on your server, the user of the AppPool will need writing access to that folder.
Also is not a good idea to use an administrator user, as it could lead to potential security breaches. However it could be a good way to check if your problem comes from there.
I think I already know what it is. When I upgraded SQL Server Express, it installed a new server .\SQLEXPRESS (because I used "new sql instance"), remote connections where configured in this server and not LocalDB, my database was still in LocalDB. But now I get other error, maybe related to WCF Data Services...
Related
I work for a large company with an intranet and Windows AD logins for everyone. We have a number of internal SQL Server databases which allow us to log in using Windows authentication, one of which I'm trying to connect to through an ASP.NET Core application. I can connect to this database through SQL Server Management Studio and query the tables fine.
I've followed the tutorial for an ASP.NET Core app using an existing database as closely as I possibly could, and created a single model class to test with to see if I could read data from the database. When debugging with IIS Express in Visual Studio, I can read data from the database when accessing the auto-generated controller and views.
Everything seems fine when debugging, but when publishing to IIS, I receive the following error:
SqlException: Login failed for user '<DOMAIN>\<COMPUTERNAME>$'.
Where domain is my domain and computername is my computer's name. This is expected, since my computer itself doesn't have access to the database. But it shouldn't be trying to connect using that system account (with the dollar sign), it should be trying to connect with my windows account: <DOMAIN>\<USERNAME>.
What's weirder, the app does seem to recognize my Windows credentials in some capacity - when I access the home page, I get the familiar "Hello, <DOMAIN>\<USERNAME>!" message in the nav bar. So the Windows credentials are definitely getting passed through to the app, but for some reason not getting passed through when trying to connect to the database through DbContext.
Am I missing something obvious here?
My Code
I started with Visual Studio's ASP.NET Core Web Application template.
In launchSettings.json, I have:
"iisSettings": {
"windowsAuthentication": true,
"anonymousAuthentication": false,
"iisExpress": {
"applicationUrl": "http://localhost:60686",
"sslPort": 44336
}
},
In appsettings.json, I have:
"ConnectionStrings": {
"MyDB": "Server=<servername>;Database=<dbname>;Trusted_Connection=True;"
},
In Startup.cs, I have the following line in ConfigureServices
services.AddDbContext<MyContext>(options => {
options.UseSqlServer(Configuration.GetConnectionString("MyDB"));
});
And from there, I have scaffolded an MVC controller with views using Entity Framework.
IIS has Windows authentication set to Yes and anonymous authentication set to No. My application pool is set to No Managed Code with ApplicationPoolIdentity.
Edit: The problem
To state the actual problem I'm trying to solve, I have a SQL Server database on a remote intranet server which allows access to a subset of the whole company via Windows authentication. If I want to create an ASP.NET application to provide an API to that database, hosted by IIS, what's the best way to do this? Assuming:
I don't want to have to manage permissions myself or have to duplicate them in some way
The people who have access to the database directly should have access to the API, the people who don't should not.
If they're accessing it from within the intranet while logged in to Windows, they shouldn't have to log in again.
I assumed I could just pass their windows credentials from IIS through the app to SQL server but I'm starting to wonder if that's actually the case.
After learning more about .NET and what Windows auth actually does on IIS, I'm going to say that what I was trying to do is not recommended. There is a difference between passing windows credentials to a .NET app in order to read from them, vs. actually executing a secondary process as that user. The latter case is what I was trying to do, but instead should set up my app pool in IIS with a user who can log in to the database, and use the windows credentials to verify against the list of users who have access.
You are using Entity-Framework for SqlServer and EF is using ADO.NET SqlClient. Therefore Trusted_Connection=yes; does not work.
Add Integrated Security=true; instead and it should be fixed.
Here some resources to read about it
https://learn.microsoft.com/en-us/dotnet/framework/data/adonet/connection-string-syntax
Not to dig up an old thread, but this is a function that should work as long as Identity Impersonate = True is set. Here's some stuff being worked on.
GitHub Doc
I'll add my answer because this is how I fixed this issue.
The reason a "$"-sign is added to the login name/user must have something to do with the IIS that the application is being hosted on.
I'm not an expert on any of this, so I can't really go in-depth, but I've added the IIS user to the Logins and then it works.
USE [master]
GO
CREATE LOGIN [IIS APPPOOL\'name'] FROM WINDOWS WITH DEFAULT_DATABASE=[master], DEFAULT_LANGUAGE=[us_english]
GO
ALTER SERVER ROLE [sysadmin] ADD MEMBER [IIS APPPOOL\'name']
GO
ALTER SERVER ROLE [securityadmin] ADD MEMBER [IIS APPPOOL\'name']
GO
ALTER SERVER ROLE [serveradmin] ADD MEMBER [IIS APPPOOL\'name']
GO
ALTER SERVER ROLE [setupadmin] ADD MEMBER [IIS APPPOOL\'name']
GO
ALTER SERVER ROLE [processadmin] ADD MEMBER [IIS APPPOOL\'name']
GO
ALTER SERVER ROLE [diskadmin] ADD MEMBER [IIS APPPOOL\'name']
GO
ALTER SERVER ROLE [dbcreator] ADD MEMBER [IIS APPPOOL\'name']
GO
ALTER SERVER ROLE [bulkadmin] ADD MEMBER [IIS APPPOOL\'name']
GO
You have to change 'name' to your IIS hosted application name. So for example if you app/site's name in ISS is "My-Backend-App" you should do:
CREATE LOGIN [IIS APPPOOL\My-Backend-App] FROM WINDOWS ...
So all the names should be "My-Backend-App".
When adding this user to the logins, my backend application could access & create the DB, create tables, access data etc...
SIDENOTE: I've used the Windows Event logger to find out this was my issue. My application just crashed, said a "500.30" error but no real information given.
You can access the "Event Viewer" application from Windows Search. Then you can go to "Applications" and there are all application errors/crashes that occured on your machine, and in this case also the reason why. It said it couldn't find user "myUser$" while trying to login to SQL, but the Windows Authentication user was "myUser". So for some reason it added a "$"-sign and couldn't log in. My fix above fixes this issue and you can login etc.
I am using Microsoft.SqlServer.Management.IntegrationServices in an ASP.NET web form to access an SSIS project in SSISDB. Testing locally on my own PC I am able to access the package from the test server and it runs fine.
My issue comes up when I try to run the site from the test server. The same test server hosts the site with IIS 7 and hosts the Sql Server database which stores the package with Integration Services. So like I said, the package is hosted on the server and when I run the site locally on my PC, all works fine.
When I run the site on test and try to access the package I get:
System.Data.SqlClient.SqlException (0x80131904): Login failed for user '[DOMAIN]\[PCNAME]$'.
I am using integrated security in my connection string:
SqlConnection connection = new SqlConnection(#"Data Source=[Test_Server];Initial Catalog=master;Integrated Security=True;");
IntegrationServices integrationServices = new IntegrationServices(connection);
My error comes up here when trying to connect.
I've tried adding '[DOMAIN]\[PCNAME]$' as a Sql login using Windows authentication with every permission I can think of. User mapping for database SSISDB has accessadmin, datareader, datawriter, owner, public, and ssis admin. I know not all of these should be needed, but I'm trying everything.
I went to SSISDB under databases, and gave the login permission to Connect, Execute, and Select.
Under Integration Services Catalogs I gave my folder, under SSISDB catalog, permission for the my Windows User ('[DOMAIN]\[PCNAME]$') login to Read, Execute Objects, and Read Objects.
I gave the SSISDataTransfer project permission for the Windows User to Read, Modify, and Execute.
I'm out of ideas and figure it's probably some IIS issue. It has Windows Authentication installed and set.
Anyone have any ideas? I've found posts about how to get the code to work, but nothing on connection specifics. Thanks!
i have had similar problem recently and i have worked with SSIS packages being used with web applications too. in my opinion you should use a custom user account to be used as your app pool account. and you will have to add this account to your database server. when running an app pool as local system or network service, the account being used for connection to a remote database server will be "DomainName\MachineName$" which will be different for every machine which tries to connect to your sql server. so instead of adding all these user names in sql, you will be better off using a custom user account.
Secondly looks like your web application does not run on the same machine as your sql server which i think will not work because you can invoke SSIS package from the same server only.
Another thing to try is to add a credential to sql server - in Security - Credentials in SQL Server management studio. This credential would be the authenitcated user that you are running it successfully under. Then in your SSIS package, in SQL Server agent, go into the job step and in the "Run As"drop down, select the new credential for your user that you created.
I having the following error message:
Cannot open database "SmallBakery" requested by the login. The login failed. Login failed for user 'IIS APPPOOL\MyAppPool'
How can correct this? I am using windows 7 Enterprise Edition and Sql server 2012.
If you don't change, each app pool has it's own identity. In your case, just add a new user to your database SmallBakery with the name IIS APPPOOL\MyAppPool using SQL Management Studio. You find the users list in the "Security/Users" subnode of your database. This should look something like that:
For testing, let the user be member of the db_owner role. If that works, remove this role and just let it be member of db_datareader and db_datawriter.
This way, each app pool (perhaps each website, if they all use their own app pool) only has access to the corresponding database.
It depends on how you want to authenticate in your app. Are you trying to use impersonation in your app?
What's happening right now is the identity of your app pool in IIS is getting passed when trying to access the database. You can change the identity of your app pool to be something that has access to the database or you could change your connection string to use a specific login instead of integrated security.
Check this post out. Your problem sounds similar to one I was running into, with the same exact error message.
http://blogs.msdn.com/b/sqlexpress/archive/2011/12/09/using-localdb-with-full-iis-part-2-instance-ownership.aspx
Like others said so far you need to take your app pool system user (IIS AppPool\myapppool) and add it as database user for that database with appropriate permissions.
Note that this will work just find on your IIS/Server but if you plan on migrating application to a different IIS/Sql server it will require changes in both SQL Server and IIS. I’d suggest you also consider sql server authentication – it may be more convenient for your specific case.
In my case these steps lead me to successfully handle this error.Hope it will help you also
I have an ASP.NET application on Server A and a SQL Server on Server B.
When running the appliction it calls a stored procedure. This procedure try to bulk insert from a file from a shared folder on Server A, but the following error occured:
Cannot bulk load because the file "\serverA_address\sharedFolder\test.txt" could not be opened. Operating system error code 5(Access is denied.).
The strange is that when I execute the bulk insert from the sql management studio directly, it runs without any exeptions.
Another observation: if I change the shared folder address to a local folder where the sql server runs (Server B) without shareing, no access denied error...
I tried to set bulkadmin permission to all the users, including the technical users: sql_serviceusr who runs the sql service, another technical user who runs the application and make the call to sql server and to the user who logged in to the application. All users are domain accounts and all servers using Kerberos authentication.
Server A: Windows Server 2008R2
Server B: Windows Server 2008R2, SQL Server 2008R2
Appreciate any help or guidance.
You are doing a double hop, so you need to enable Kerberos delegation.
You could create a connect account and use SQL authentication.
In my experience, getting our network folks to properly set up Kerberos is like pulling teeth. We had it working for one glorious week once and then it suddenly stopped working. It just wasn't worth the hassle after that.
This might not be the exact answer you're looking for, but could be an interim solution for you.
By your description of the error, I assume the problem is in sharing the folder.
When sharing a folder, you should give access to the user who will be accessing the folder from remote computer in two places in folder's properties: under the Share tab and under Security tab.
Did you give access in both of them?
I have a Website and it works fine locally (when I run it using MS Visual Studio 2010), but When I uploaded it on the Web, it gives me this error message!
So, please what should I do to fix this problem?
Many thanks.
Look at the authentication information in your connection string. Whatever user is trying to access the database, make sure they have permission.
Posting the connection string stored in ATRProDBConnStr might give more insight as well.
So, please what should I do to fix this problem?
You should check the permissions between the web application and the SQL server.
Is the connection string correct (providing the correct user credentials for the application)?
Does the production database have grant the same permissions to the application's database user as the local database?
If the application doesn't use credentials, does the database grant the same permissions to the server's web application user as it does the local application user?
The error is basically SQL server telling you that your application isn't allowed to perform an action on the database. The application works fine (except for the lack of error handling which generated this page), it just needs permissions on the SQL server.