Could not create SSL/TLS secure channel.

When I test the Push-messages on Repetier-host I get this error.  I also get a popup that says "Could not call informer server"  Any ideas what I am doing wrong?


  • Does 2.1.6 already have the checkbox to not use SSL connection in settings?
    I already fixed that for next update. You are not doing anything wrong, but windows now requires new settings to use TLS for https to use current certificates.
  • OK, Thanks.  I see the check box in Config->Preferences->Push-Messages.  The check box is labeled:  Use http instead of https for sending (only required for Windows XP).
    I check that box and it works!  Thanks!  I hope that this post will help someone else too....

  • INCREDIBLE. I needed a long time to found your answer. I think, this little box is not at the right place. And the win XP thing is wrong.
  • 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 c# socket 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
    //createing HttpWebRequest after ServicePointManager settings
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create("")

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

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