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Recently there have been lots of posts and incidents because of Dynamics 365 v9.0 enforcing TLS 1.2
To resolve this i.e. enforcing your application to connect through TLS 1.2 there are various options available out there.
I have tried to list down all the options I came across in this code
If you are having source code that you are building you can use on of the options available below:
1. Use following before your connection request is made. This will enforce TLS 1.2
System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
2. Change your framework version to 4.6 or above and you don’t need to additional work (or line of code highlighted above)
A quick summary of .Net framework and TLS Support
Other scenario can be that you have a prebuilt application and none of the solutions highlighted above works (in this case a plugin registration tool)
1. You can resolve it by adding the following line to the <runtime> section of the app.config file (provided that application is built against supported .Net framework):
In case you have multiple applications running on a server (compiled in version supporting TLS 1.2) you can do registry edit to enforce all applications on server to utilize highest possible version. Be careful with this fix as it might cause negative impacts on other applications.
The post Follow-up on TLS 1.2 issue in Dynamics 365 appeared first on Abhinav Ranjan.
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