• Which the release of FS2020 we see an explosition of activity on the forun and of course we are very happy to see this. But having all questions about FS2020 in one forum becomes a bit messy. So therefore we would like to ask you all to use the following guidelines when posting your questions:

    • Tag FS2020 specific questions with the MSFS2020 tag.
    • Questions about making 3D assets can be posted in the 3D asset design forum. Either post them in the subforum of the modelling tool you use or in the general forum if they are general.
    • Questions about aircraft design can be posted in the Aircraft design forum
    • Questions about airport design can be posted in the FS2020 airport design forum. Once airport development tools have been updated for FS2020 you can post tool speciifc questions in the subforums of those tools as well of course.
    • Questions about terrain design can be posted in the FS2020 terrain design forum.
    • Questions about SimConnect can be posted in the SimConnect forum.

    Any other question that is not specific to an aspect of development or tool can be posted in the General chat forum.

    By following these guidelines we make sure that the forums remain easy to read for everybody and also that the right people can find your post to answer it.

FSX Sim Connect on Client getting Side by Side Configuration Incorrect error?

I just did a new install of FSX on a dedicated pc and I am now setting up a second pc to run network capable addons such as Active Sky Next. I followed the instructions in the wiki for the install and configuration of the SDK, and setup the various configuration files.

All went well on the FSX Server pc, the tools menu is showing and all appears to be working.

The Client pc worked initially as tested by running several of the sample apps in the SDK. All of them connected and I was able to read data from the sim using the facilitiesdata sample app.

I then installed ASN and it gave no error messages but would not connect to FSX. I posted a comment on their forum and it was suggested that I might not have SDK SP2 installed. I was relatively certain that I did as I followed the wiki steps, but decided to double check. I launched the sdk.msi app on the Accelleration disk again and it came up with the option to repair the installation. So it would seen that I had installed it. I let the repair run in case something had gone wrong initially. Still ANS would not connect.

I then attempted an uninstall and re-install of the SDK on the Client, now when ASN is launched it no longer sees SimConnect at all and pops up an error message as soon as it launched stating this. I went back to run the sample apps again and I am now getting a windows error message stating the "The application has failed to start because its side-by-side configuration is incorrect"


SimConnect.cfg from client

SimConnect.xml from server
<?xml version="1.0" encoding="Windows-1252"?>
<SimBase.Document Type="SimConnect" version="1,0">



  • ADE-Check-Report Client PC.txt
    1.2 KB · Views: 492
  • ADE-Check-Report Server PC.txt
    1.3 KB · Views: 490
Last edited:
Problem Solved!

Turned out to be corruption in one of the .NET Framework installs. Unfortunately, all attempts to repair or re-install the .NET frameworks failed. The final solution was wipe the drive clean and re-install Windows.

Painful, but successful!
Has anyone else run into this problem and solved it by not having to re-install windows?

I'm moving my app to a new PC with windows 10 on it and am getting the same error message. My win10 is a new install.