Windows 10: TLS 1.2 with Windows Server 2016 and .NET 3.5

Hi,I have a Windows WCF app written in .NET 3.5 trying to run with TLS 1.2 which generates a "System.NotSupportedException: The requested security protocol is not supported" on Windows Server 2016 Version 1607 OS build 14393.4402.As per this, the error would occur if the hotfix is not installed. According to this, the TLS 1.2 support for .NET 3.5 was introduced as hotfix in kb3156421 in Windows Server 2016 Technical Preview 4 so should already be a part of official release. Also, all windows updates till April 2021 have also been installed. The same app can run on another Windows S

:)

 

Microsoft Edge TLS Security

After trying everything (not a lot of steps) listed in the Microsoft Edge support site, I did a wider search and found this very simple youtube video that fixed it immediately:

For those who prefer not to click links the steps are simple:

1. Click in the Cortana search bar next to the Win 10 Start button

2. Type internet options

3. Select internet options (control panel) from the list

4. Click on the advanced tab

5. Scroll down to the security section

6. Make sure the following are all clicked:
Use SSL 3.0
Use TLS 1.0
Use TLS 1.1
Use TLS 1.2

7. Click apply

8. Refresh the page that was giving the error and it should now connect.

Hope this helps, it was a 30 second fix after hours of pounding my head against the error with the Support site suggestions.

 

Need information on NET Framework support to TLS 1.1 & TLS 1.2 after disabling TLS 1.0

Hi Guys ,

I'm planning to disable TLS 1.0 in our SQL Server and we are testing whether everything is working fine or not after disabling TLS 1.0

OS : Win 2012

Net Framework :4.5.5

SQL Version:

Microsoft SQL Server 2012 (SP4) (KB4018073) - 11.0.7001.0 (X64)

Aug 15 2017 10:23:29

Copyright (c) Microsoft Corporation

Enterprise Edition (64-bit) on Windows NT 6.2 <X64> (Build 9200: ) (Hypervisor)

As per the below link provided by the MS it stats .NET Framework 4.6 is required in order to support ADO Components other wise we cant connect to SQL Server using SSMS

but i dont have .Net frame work 4.6 installed on my machine and also we don't have .NET Framework hot fix mentioned in the below link were not installed on SQL Machine

KB3135244 - TLS 1.2 support for Microsoft SQL Server

Question:How we are able to connect to SQL Server using SSMS even though required NET Framework in not installed ?

Please suggest

 

Windows Server 2016 KB4343887 Broke TLS

Hello,

Months ago we migrated all of our code and systems that access the Shopify API to TLS 1.2. We met the deadline and had no downtime from the required tls 1.2 transition. However, yesteday we discovered that our code was not making connections to the API.
We had utilized the tool IISCrypto to assist us in setting up the server for tls 1.2. Once we discovered the error in our code to the Shopify API was related to tls we opened IISCrypto. To our surprise every box was checked, even tls 1.0 and tls 1.1. This
is not how we set it up. After editing the server TLS settings using the IISCrypto tool, and then verifying the changes in the registry we were still getting the error "The underlying connection was closed: An unexpected error occurred on a send." Regardless
of changes we made via IISCrypto and validating that the code was forcibly using the SecurityProtocal for tls1.2, the code still generated the same error.

Because of data that we store when shopify data is updated from actions initiated by staff on our own website we are able to pinpoint exactly when our connections to the Shopify API started to fail. It was on the same day that a Windows Update was installed.
The update was "2018-08 Cumulative Update for Windows Server 2016 for x64-based Systems (KB4343887)". We eventually decided to uninstall the update from the server. Once the update was removed all connectiivity to the Shopify API was restored. Our automated
processes were now working again.

Question: Is there anything in Microsoft update KB4343887 that would be in conflict with the Shopify API?

Question: Has anyone else seen this behavior after applying the update?

Our server is Windows Server 2016 Essentials.