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[Solved] I get the following error when i try to connect to my server over HTML5 Portal "Error: Protocol Security Negotiation Failure"

Protocol = RDP

UTM = 9.4

Server = 2012 R2

Browser = FF 45.0.1


Any suggestions? Usual RDP connections in local network works perfect!

Edit: Ok, i have found the fault. The RDP Connection on the Server 2012 was wrong configured



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  • Can you explain what you changed in RDP Connection settings on the Win 2012 server?

    • Hi Ryan,

      in my case i must uncheck this option.


      Best Regards

      • Thank you, but could you send the English version of the picture?

        • I'm sorry.

          I have only german versions of my Windows installations but the translation of the option is:

          "Allow connections only from computers running Remote Desktop with Network Level Authentication"

          Here a screenshot from Internet

          https://www.bing.com/images/search?q=remote+desktop+settings+2012&view=detailv2&&id=4A491AE2669C63DC1CE0EABC272C0D0595DAF7D9&selectedIndex=47&ccid=5pyZ0f8l&simid=608022814396777497&thid=OIP.Me69c99d1ff25acc3ef0bfb38bb8d69f3o0&ajaxhist=0

          I hope this helps

          • This worked for me as well!