Microsoft KB Archive/231343

= PRB: Upgrading to RDS 2.x from RDS 1.x May Break Applications =

Article ID: 231343

Article Last Modified on 2/12/2007

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APPLIES TO


 * Microsoft Plus! Game Pack: Cards & Puzzles
 * Microsoft Remote Data Services 1.1
 * Microsoft Remote Data Services 1.5
 * Remote Data Service for ADO 2.0
 * Microsoft Remote Data Services 2.0
 * Microsoft Remote Data Services 2.1
 * Microsoft Remote Data Services 2.1
 * Microsoft Remote Data Services 2.1
 * Remote Data Service for ADO 2.5
 * Remote Data Service for ADO 2.6
 * Microsoft Remote Data Services 2.0

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This article was previously published under Q231343



SYMPTOMS
After upgrading from Remote Data Services (RDS) 1.x to version 2.0 or later, your application may report the following error:

Error: The specified Handler has denied Access.



CAUSE
With the advent of version 2.0, RDS implements a new security feature called Handlers. When Handlers are enabled, any unknown Connection string is rejected (the default behavior of the Handler.) An unknown connection string is defined as any connection string not in the MSDFMAP.INI handler file located in the Operating System Root Directory (C:\WINNT for example.)



RESOLUTION
Handlers can be disabled by running;

"C:\Program Files\Common Files\System\msadc\Handunsf.reg"

After running the Handunsf.reg file, the computer must be rebooted in order for the changes to take effect.

This method is NOT RECOMMENDED. Handlers are not difficult to administer. See the REFERENCES section below for more details.



STATUS
This behavior is by design.

