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  • 1.  Desktop 16.2.26 error when running on Windows Server 16

    Posted 04-23-2019 18:22
      |   view attached
    A customer got the following error: The client and server cannot communicate, because they do not possess a common algrithm

    I'm five9s sure this is because they are running on Windows Server 2016 (only supported thru Windows 2012 R2)....

    Has anyone had a work around for this?

    Found this... https://www.ryadel.com/en/asp-net-client-server-cannot-comunicate-because-they-possess-common-algorithm-how-to-fix-c-sharp/

    See attach for error...
    #Omni-ChannelDesktop/UserInterface

    ------------------------------
    Thomas Moore
    Avtex
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  • 2.  RE: Desktop 16.2.26 error when running on Windows Server 16

    Posted 04-24-2019 10:48
    Edited by Mark Tatera 04-24-2019 10:49
    Thomas,

    EDIT: I assume Desktop 16.2.26 means they are running CIC 2016 R2 P26. In this case server 2016 would not yet be supported but I think you can probably "fix" this by enabling the older less secure TLS versions on the Server 2016 box.

    This seems to be a encryption protocol issue. You will need to check to see what TLS versions both the server and client side applications support. According to http://testlab.inin.com/ProductsPage.aspx?ProductType=20 Server 2016 is supported starting with CIC 2018 Rx and up. Doing a quick search Windows changed what TLS versions are supported with windows 10 and server 2016, take a look here https://docs.microsoft.com/en-us/windows-server/security/tls/tls-registry-settings

    There is also this great Stackexchange post about the exact error for another C# application. https://stackoverflow.com/questions/26742054/the-client-and-server-cannot-communicate-because-they-do-not-possess-a-common-a

    Thanks,

    ------------------------------
    Mark Tatera
    ConvergeOne

    Opinions are my own and not the views of my employer. Any suggestions or programming changes I suggest come with no warranty and should be tried at your own risk.
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