Connection to remote SQL server breaks when upgrading web server to .net framework 4.6.1

Question

We\'re currently working on updating our asp.net web application (hosted on IIS 7.5) from .net framework v4.5 to v4.6.1. On small lower environments/local development in which S

Answer 1

The following article describes a new default connection string setting for SQL Server connections in .net 4.6.1.

https://blogs.msdn.microsoft.com/dataaccesstechnologies/2016/05/07/connection-timeout-issue-with-net-framework-4-6-1-transparentnetworkipresolution/

This was to solve one problem in some environments, but also caused the issue you are experiencing in other environments.

Basically, you'll want to add the following your connection string:

TransparentNetworkIPResolution=False;