You configure your connection string within Microsoft Biztalk Adapter for DB2 to use Kerberos to securely connect to a DB2 database on z/OS. When you run the application, it fails, and you receive the following error message:

Could not connect to data source 'Datasource':
An error occured validating the server token: The token supplied to the function is invalid 

More information

The Microsoft DRDA Application Requester runtime library is updated in this update to support the DRDA ACCSEC (Access Security) and SECCHK (Security Check) protocol code points by using Kerberos security authentication when you connect to IBM DB2 for z/OS.


The fix that resolves this problem is included in the following cumulative updates for Host Integration Server:

Cumulative Update 2 for Host Integration Server 2016

Cumulative Update 4 for Host Integration Server 2013


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


Learn about the terminology Microsoft uses to describe software updates.

Third-party information disclaimer

The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.

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