472,331 Members | 1,953 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

Join Bytes to post your question to a community of 472,331 software developers and data experts.

Windows authentication from ASP.NET to SQL Server

Hello,

I am having trouble using Integrated Windows Authentication between our
intranet server and our database server, both of which are on our local
domain.

Windows authentication works for our intranet server - my domain user
"DOM\nme" is correctly authenticated and authorized to view the ASP.NET page
on our intranet. The ASP.NET application uses impersonation (<identity
impersonate="true"> in Web.config).

Windows authentication also works for the SQL Server; when logged on to the
domain, I can start Query Analyzer and connect to the SQL Server using
Windows authentication. Permissions on the SQL Server are also correctly set
up.

However, problems arise when I want to connect to the SQL Server from the
ASP.NET page - I get the fairly common error message below:

Login failed for user '(null)'. Reason: Not associated with a trusted SQL
Server connection.

Although I do get a lot of hits when searching for this specific error, I
still can't seem to find the cause of the problem.

The connection string I'm using to connect to the SQL Server is:
"Server=DB;Integrated Security=SSPI;Database=IntranetDB".

When setting <identity impersonate="false">, I get the error message "Login
failed for user 'DOM\INTRANET$'." - DOM\INTRANET$ is the hostname of the
intranet server.

In the database servers event log, I can see two events (supplied below)
after trying to authenticate (unsuccessfully) from the ASP.NET application
to the SQL Server as "DOM\nme".

What do I need to do to let users use Windows authentication against the DB
server as well?
Regards,
Nils Magnus Englund
(event log entries follows...)
Date: 08.08.2005
Source: Security
Time: 15:14:55
Category: Logon/Logoff
Type: Success Audit
Event ID: 540
User: NT AUTHORITY\ANONYMOUS LOGON
Computer: DB

Description:
Successful Network Logon:
User Name:
Domain:
Logon ID: (0x0,0x5CE408)
Logon Type: 3
Logon Process: NtLmSsp
Authentication Package: NTLM
Workstation Name: INTRANET
Logon GUID: -
Caller User Name: -
Caller Domain: -
Caller Logon ID: -
Caller Process ID: -
Transited Services: -
Source Network Address: -
Source Port: -
Date: 08.08.2005
Source: Security
Time: 15:14:55
Category: Logon/Logoff
Type: Success Audit
Event ID: 538
User: NT AUTHORITY\ANONYMOUS LOGON
Computer: DB

Description:
User Logoff:
User Name: ANONYMOUS LOGON
Domain: NT AUTHORITY
Logon ID: (0x0,0x5CE408)
Logon Type: 3



Nov 19 '05 #1
8 3304
Do you have anonymous authentication disabled in IIS?
If so, do you have <authentication mode="Windows" /> set in your
web.config?

Nov 19 '05 #2
The easiest way is to turn off anonymous access for the Intranet site. This
will force authentication, usually through a login box (although the network
admins can alleviate this through policy).

--
Gregory A. Beamer
MVP; MCP: +I, SE, SD, DBA

***************************
Think Outside the Box!
***************************
"Nils Magnus Englund" wrote:
Hello,

I am having trouble using Integrated Windows Authentication between our
intranet server and our database server, both of which are on our local
domain.

Windows authentication works for our intranet server - my domain user
"DOM\nme" is correctly authenticated and authorized to view the ASP.NET page
on our intranet. The ASP.NET application uses impersonation (<identity
impersonate="true"> in Web.config).

Windows authentication also works for the SQL Server; when logged on to the
domain, I can start Query Analyzer and connect to the SQL Server using
Windows authentication. Permissions on the SQL Server are also correctly set
up.

However, problems arise when I want to connect to the SQL Server from the
ASP.NET page - I get the fairly common error message below:

Login failed for user '(null)'. Reason: Not associated with a trusted SQL
Server connection.

Although I do get a lot of hits when searching for this specific error, I
still can't seem to find the cause of the problem.

The connection string I'm using to connect to the SQL Server is:
"Server=DB;Integrated Security=SSPI;Database=IntranetDB".

When setting <identity impersonate="false">, I get the error message "Login
failed for user 'DOM\INTRANET$'." - DOM\INTRANET$ is the hostname of the
intranet server.

In the database servers event log, I can see two events (supplied below)
after trying to authenticate (unsuccessfully) from the ASP.NET application
to the SQL Server as "DOM\nme".

What do I need to do to let users use Windows authentication against the DB
server as well?
Regards,
Nils Magnus Englund
(event log entries follows...)
Date: 08.08.2005
Source: Security
Time: 15:14:55
Category: Logon/Logoff
Type: Success Audit
Event ID: 540
User: NT AUTHORITY\ANONYMOUS LOGON
Computer: DB

Description:
Successful Network Logon:
User Name:
Domain:
Logon ID: (0x0,0x5CE408)
Logon Type: 3
Logon Process: NtLmSsp
Authentication Package: NTLM
Workstation Name: INTRANET
Logon GUID: -
Caller User Name: -
Caller Domain: -
Caller Logon ID: -
Caller Process ID: -
Transited Services: -
Source Network Address: -
Source Port: -
Date: 08.08.2005
Source: Security
Time: 15:14:55
Category: Logon/Logoff
Type: Success Audit
Event ID: 538
User: NT AUTHORITY\ANONYMOUS LOGON
Computer: DB

Description:
User Logoff:
User Name: ANONYMOUS LOGON
Domain: NT AUTHORITY
Logon ID: (0x0,0x5CE408)
Logon Type: 3



Nov 19 '05 #3
"Stefan" <Cl*********@gmail.com> wrote in message
news:11**********************@g14g2000cwa.googlegr oups.com...
Do you have anonymous authentication disabled in IIS?
If so, do you have <authentication mode="Windows" /> set in your
web.config?


In reply to both Stefan and Gregory;

Anonymous authentication is disabled, and I have authentication mode
"Windows" set in Web.config.

Again, let me specify that the Windows authentication for the ASP.NET page
works, and the User.Identity part successfully retrieves the domain user.
It's the Windows authentication to the SQL Server from the ASP.NET page that
causes trouble.
Regards,
Nils Magnus Englund
Nov 19 '05 #4
Nils hae you give your database and table the ASPNET account permission?
Try doing that.
Patrick
"Nils Magnus Englund" <ni*****************@orkfin.no> wrote in message
news:O7**************@TK2MSFTNGP15.phx.gbl...
"Stefan" <Cl*********@gmail.com> wrote in message
news:11**********************@g14g2000cwa.googlegr oups.com...
Do you have anonymous authentication disabled in IIS?
If so, do you have <authentication mode="Windows" /> set in your
web.config?
In reply to both Stefan and Gregory;

Anonymous authentication is disabled, and I have authentication mode
"Windows" set in Web.config.

Again, let me specify that the Windows authentication for the ASP.NET page
works, and the User.Identity part successfully retrieves the domain user.
It's the Windows authentication to the SQL Server from the ASP.NET page

that causes trouble.
Regards,
Nils Magnus Englund

Nov 19 '05 #5
Hi Patrick,

Since the database server isn't the same server as the ASP.NET server, and
since ASPNET is a local user, I cannot use that user to set permissions on
the database server. However, because of the identity impersonation, is the
application supposed to be connecting as ASPNET at all?
Regards,
Nils Magnus Englund

"Patrick.O.Ige" <na********@hotmail.com> wrote in message
news:%2****************@TK2MSFTNGP14.phx.gbl...
Nils hae you give your database and table the ASPNET account permission?
Try doing that.
Patrick
"Nils Magnus Englund" <ni*****************@orkfin.no> wrote in message
news:O7**************@TK2MSFTNGP15.phx.gbl...
"Stefan" <Cl*********@gmail.com> wrote in message
news:11**********************@g14g2000cwa.googlegr oups.com...
> Do you have anonymous authentication disabled in IIS?
> If so, do you have <authentication mode="Windows" /> set in your
> web.config?


In reply to both Stefan and Gregory;

Anonymous authentication is disabled, and I have authentication mode
"Windows" set in Web.config.

Again, let me specify that the Windows authentication for the ASP.NET
page
works, and the User.Identity part successfully retrieves the domain user.
It's the Windows authentication to the SQL Server from the ASP.NET page

that
causes trouble.
Regards,
Nils Magnus Englund


Nov 19 '05 #6
On Tue, 9 Aug 2005 08:21:08 +0200, "Nils Magnus Englund" <ni*****************@orkfin.no> wrote:

Hi Patrick,

Since the database server isn't the same server as the ASP.NET server, and
since ASPNET is a local user, I cannot use that user to set permissions on
the database server. However, because of the identity impersonation, is the
application supposed to be connecting as ASPNET at all?


If your ASP.NET app is configured for Integrated Windows security, credentials cannot be delegated
by IIS to the remote database server w/o implementing Kerberos.

The reason for this is that NTLM authenticates credentials under IIS Integrated Windows security so
IIS never receives the credentials and cannot forward them for delegation.
Paul
~~~~
Microsoft MVP (Visual Basic)
Nov 19 '05 #7
> If your ASP.NET app is configured for Integrated Windows security,
credentials cannot be delegated
by IIS to the remote database server w/o implementing Kerberos.

The reason for this is that NTLM authenticates credentials under IIS
Integrated Windows security so
IIS never receives the credentials and cannot forward them for delegation.

But why can't I use Kerberos authentication? Is it anyway to force the
application to use Kerberos? The WindowsIdentity.AuthenticationType property
returns "Negotiate" - this should be "Kerberos", should it not?
Regards,
Nils Magnus Englund
Nov 19 '05 #8
On Tue, 16 Aug 2005 11:35:17 +0200, "Nils Magnus Englund" <ni*****************@orkfin.no> wrote:

> If your ASP.NET app is configured for Integrated Windows security,
> credentials cannot be delegated
> by IIS to the remote database server w/o implementing Kerberos.
>
> The reason for this is that NTLM authenticates credentials under IIS
> Integrated Windows security so
> IIS never receives the credentials and cannot forward them for delegation.


But why can't I use Kerberos authentication? Is it anyway to force the
application to use Kerberos? The WindowsIdentity.AuthenticationType property
returns "Negotiate" - this should be "Kerberos", should it not?


You can use Kerberos, but your environment must be configured for it. The following should help:

http://msdn.microsoft.com/library/de...delegation.asp
http://msdn.microsoft.com/library/de...SecNetHT05.asp
Paul
~~~~
Microsoft MVP (Visual Basic)
Nov 19 '05 #9

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

8
by: Bob Everland | last post by:
I have an application that is ISAPI and the only way to secure it is through NT permissions. I need to have a way to login to windows...
2
by: Joseph Geretz | last post by:
I'm having a credentialing problem in my web application. Actually, I don't think this is an IIS security issue, since I'm able to access the page...
3
by: Reza | last post by:
Hello I tried this friday, but didn't get anywhere so trying again Basically, I have a fixed list of people that can access the application in...
1
by: Thomas Scheiderich | last post by:
I am having a problem connecting to an Sql Server using Windows Authentication. I am using the following command: ...
5
by: pberna | last post by:
Dear all, I built a Web Form application to start and stop a Windows Service remotely. I successful tested the application on Windows 2000 server...
6
by: mcollier | last post by:
I am running a Windows Server 2003 machine as my web server. I would like to use Windows authentication for connections to my SQL Server 2000...
6
by: Kevin Yu | last post by:
is it possible to for user to click a logout button to logout and when the user want to get into the system again, the user have to login again? ...
7
by: Alice Wong | last post by:
I am setting up my Web ASP.net application to connect to Sql server using windows authentication. I set up IIS to have integrated windows...
4
by: Preben Zacho | last post by:
Hi there The scenario I got is this: I have created a Windows application in VS and I want to deploy it to another machine running Windows Vista....
0
by: tammygombez | last post by:
Hey fellow JavaFX developers, I'm currently working on a project that involves using a ComboBox in JavaFX, and I've run into a bit of an issue....
0
by: concettolabs | last post by:
In today's business world, businesses are increasingly turning to PowerApps to develop custom business applications. PowerApps is a powerful tool...
0
by: teenabhardwaj | last post by:
How would one discover a valid source for learning news, comfort, and help for engineering designs? Covering through piles of books takes a lot of...
0
by: CD Tom | last post by:
This only shows up in access runtime. When a user select a report from my report menu when they close the report they get a menu I've called Add-ins...
0
by: Naresh1 | last post by:
What is WebLogic Admin Training? WebLogic Admin Training is a specialized program designed to equip individuals with the skills and knowledge...
0
by: antdb | last post by:
Ⅰ. Advantage of AntDB: hyper-convergence + streaming processing engine In the overall architecture, a new "hyper-convergence" concept was...
0
by: Matthew3360 | last post by:
Hi there. I have been struggling to find out how to use a variable as my location in my header redirect function. Here is my code. ...
2
by: Matthew3360 | last post by:
Hi, I have a python app that i want to be able to get variables from a php page on my webserver. My python app is on my computer. How would I make it...
0
by: AndyPSV | last post by:
HOW CAN I CREATE AN AI with an .executable file that would suck all files in the folder and on my computerHOW CAN I CREATE AN AI with an .executable...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.