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forderud_ge's avatar
forderud_ge
Copper Contributor
Apr 18, 2022

InTune management extension SecureChannelFailure (Could not create SSL/TLS secure channel)

I'm experiencing networking problem when Microsoft Endpoint manager is trying to deploy InTune management extension from https://endpoint.microsoft.com/ to a Win10 device within a company network. ...
Intune Management Extension
evanchatter37's avatar
evanchatter37
Copper Contributor
Jun 15, 2022

The error is generic and there are many reasons why the SSL/TLS negotiation may fail. ServicePointManager.SecurityProtocol property selects the version of the Secure Sockets Layer (SSL) or Transport Layer Security (TLS) protocol to use for new connections; existing http://csharp.net-informations.com/communications/csharp-socket-programming.htm connections aren't changed. Make sure the ServicePointManager settings are made before the HttpWebRequest is created, else it will not work. Also, you have to enable other security protocol versions to resolve this issue:

ServicePointManager.Expect100Continue = true;
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12
SecurityProtocolType.Tls
SecurityProtocolType.Tls11
SecurityProtocolType.Ssl3;

//createing HttpWebRequest after ServicePointManager settings
HttpWebRequest request = (HttpWebRequest)WebRequest.Create("https://google.com/api/")

 

If you create HttpWebRequest before the ServicePointManager settings it will fail and shows the error message.

 

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