Error "A connection was successfully established with the server, but then an error occurred..." (4307327)

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Error "A connection was successfully established with the server, but then an error occurred..."
Description

When trying to connect to a SQL Server database, the following error is displayed and Toad also may crash.
"SQL Server Database Error
A connection was successfully established with the server, but then an error occurred during the login process. (provider: SSL Provider, error:0 - The message received was unexpected or badly formatted.)"
Cause

Appears to be caused by known Microsoft .NET 4.5.1 issue: - 2915689
Example 4 in the article is what is displayed in the exception log when the above error occurs with a crash.
Resolution

This Microsoft .NET issue has been addressed in .NET 4.5.2 which can be downloaded here.
Additional Information

This issue only occurs if Microsoft .NET 4.5.1 is installed on client PC. Release notes for TDP 3.3 and 3.4 require .NET 4.0 and 4.5 respectively. This issue seems to be being reported by folks other than Toad users: http://mannysiddiqui.wordpress.com/2014/01/21/net-framework-4-5-1-broke-net-4-0-application/ http://www.sqlservercentral.com/Forums/Topic1529609-2799-1.aspx

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