Unable to connect to Dynamics 365 (online), version 9.0 using SDK tools

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This article provides a solution to an issue where you're unable to connect to Dynamics 365 (online), version 9.0, using SDK tools.

Applies to:   Microsoft Dynamics CRM
Original KB number:   4077479

Symptoms

You're unable to connect to Dynamics 365 (online), version 9.0, using SDK tools such as the Plugin Registration Tool or Configuration Migration Tool. After providing the connection information and selecting the Login button, you're returned back to the login dialog.

Cause

It can occur if you are not using the latest version of the SDK tools that use TLS 1.2. Dynamics 365 (online), version 9.0, requires TLS 1.2 or later. TLS 1.0 and 1.1 are no longer supported.

Resolution

Download the latest version of the SDK tools from Nuget.

More information

For more information about the change to requiring TLS 1.2, see Microsoft Dynamics 365 Customer Engagement (online) to require TLS 1.2 for connectivity.