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What does the following NAV error mean: "There is a communication protocol mismatch between the client and the server. The application will close."?

Overview

Getting error message when trying to connect to AvaTax in RTC.

"There is a communication protocol mismatch between the client and the server. The application will close.

Environment

NAV 2009 R2 RTC environment

Resolution

  • This is not an AvaTax error. Instead this is related to the version of NAV on the server and client
  • This error usually means your server that hosts NAV is not running the same version of NAV as the computer your user is trying to work on.
  • You will need to check the build of NAV on your server and the build on the client (local machine) 
    • Then update NAV, so that both server and client are on the same build.
  • Please review the Microsoft Dynamics NAV Knowledge Base for more information

 

Note: AvaTax for Microsoft Dynamics NAV 2009 is sunsetted and no longer supported by Avalara as of April 30, 2016. This existing knowledge base documentation is available to provide known paths to resolution for documented issues. If you are using a version affected by service discontinuation and want to maintain access to Avalara Support, you’ll need to upgrade to the latest version of the integration as soon as possible