PRTG SQL Sensor error
Published: Thursday, 13 September 2018 | Categories: PRTG | Keywords: SQL | Status: Posted | Created: Thursday, 13 September 2018 | Author: paul

After recent windows update some PRTG SQL sensors have stopped working reporting the error "(Microsoft SQL DEPRECATED) Down  (The type initializer for 'System.Data.SqlClient.SqlConnection' threw an exception.)".

By removing the updates individually it was determined that the error was caused by KB4457035 "Update for Microsoft .NET Framework 4.6". Removing that update and rebooting the server resolved the issue.

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