FIX: DQS Won't Work after upgrading to CU1 – SQL Exception 0x80131904

There are lots of reports of data quality services (DQS) not working after installing CU1 for SQL Server 2012. One symptom is that when trying to connect from the DQS client, you receive the following error: "System.Data.SqlClient.SqlException (0x80131904): An error occurred in the Microsoft .NET Framework while trying to load assembly id 65581"

After applying CU1, you need to execute:

dqsinstaller.exe -upgrade

This is typically from the folder C:\Program Files\Microsoft SQL Server\MSSQL11.MSSQLSERVER\MSSQL\Binn (but depends upon your installation path)

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