Microsoft KB Archive/229286

= Cannot connect to SQL database on Windows NT Server computer with IIS =

Article ID: 229286

Article Last Modified on 7/3/2006

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APPLIES TO


 * Microsoft FrontPage 2000 Standard Edition

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This article was previously published under Q229286



We strongly recommend that all users upgrade to Microsoft Internet Information Services (IIS) 6.0 running on Microsoft Windows Server 2003. IIS 6.0 significantly increases Web infrastructure security. For more information about IIS security-related topics, visit the following Microsoft Web site:

http://www.microsoft.com/technet/security/prodtech/IIS.mspx



SYMPTOMS
On a Windows NT Server computer running Internet Information Server (IIS) version 3.0, 4.0, or 5.0, the following ODBC error message appears when you try to verify a connection to a remote SQL database:

ODBC Error: "Client cannot establish connection." SQL ODBC Driver (SQLSRV32.dll) version 3.70.05.87 (10/04/98)



CAUSE
Microsoft SQL Server Integrated Security requires NTLM authentication in order to map user accounts to SQL Server accounts.

After a Web browser is authenticated by IIS, an authenticated connection to the SQL Server is not possible. IIS is using the IUSR account when it attempts to connect to SQL Server. When using the IUSR account to connect to the SQL Server, NTLM authentication is used.

Essentially, IIS does not have the necessary information to complete the NT authentication process.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.



MORE INFORMATION
To work around this issue, use one of the following methods:

Method 1: Host IIS and SQL Server on the Same Computer
By eliminating the need for IIS to create an authenticated connection to SQL Server, you can work around this issue.

To do this, you must use a data source name (DSN) that looks directly to the local computer for the SQL Server, and not to the network. This can be done by using the "(local)" setting in a System DSN.

Method 2: Use Basic Authentication Instead of NTLM in IIS
By using Basic Authentication, the password is BASE64 encoded and sent to IIS during the authentication process. With the password, IIS can now complete the NTLM authentication process when connecting to SQL Server.

Note With Basic authentication, we recommend that the data be encrypted by using SSL because it is very easy to obtain credentials from a network trace.

Method 3: Map the Anonymous User Account from IIS to a SQL Server Guest Account
This method assumes that all users will have the same level of privileges to the SQL Server resources. Every user browsing to the Web will have access to the database.

For more information about creating connections to SQL Server, click the following article numbers to view the articles in the Microsoft Knowledge Base:

176377 Accessing SQL Server with integrated security from ASP

176378 How To SQL Server with integrated security, IIS on same machine

176379 How to set up IIS and SQL Server on separate machines with a trusted connection

176380 How to use ASP with a SQL trusted connection with guest account

Additional query words: front page FP2000

Keywords: kbbug kbpending KB229286

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