RDP connection issue in Azure VM

Question

HI
i have one VM in Azure , and since last week i am not able to connect to the vm, after troubleshooting i have added the TLS registry keys after that i am able to connect , any one can help me to find out the importance of TLS in RDP connections.
thank you

Answer 1

@Antony Maxwin

Welcome to Microsoft Q&A Platform, thanks for posting your query here.

Glad to know that you have resolved the RDP connection issue with Azure VM by adding TLS registry.

I have added Windows related tags to this thread so that SME's from that area could help answer your query.

However, I will try to provide some information here that can help you.

Depending on the system, RDP uses the TLS 1.0, 1.1, or 1.2 (server) protocol for connection. TLS and SSL protocols use a client/server model and are based on certificate authentication.

To query how these protocols are set up on the VM, open a CMD instance, and then run the following commands:

reg query "HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.0\Server" /v Enabled  
reg query "HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.1\Server" /v Enabled  
reg query "HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Server" /v Enabled  

Please check below documents for more details on this protocol:

https://learn.microsoft.com/en-us/windows-server/security/tls/tls-ssl-schannel-ssp-overview

https://learn.microsoft.com/en-us/mem/configmgr/core/plan-design/security/enable-tls-1-2-client#bkmk_protocol

https://social.technet.microsoft.com/Forums/en-US/ff98d296-42cb-4f4d-a69f-c8dea82453ad/how-windows-server-2012-r2-use-tls-12-for-remote-desktop-connection?forum=winserver8gen

Hope that helps.
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