openfsd supports the modern VATSIM FSD protocol. Clients using protocol revisions older than 100 (VatsimAuth) are not supported. This includes clients designed to connect to the classic Marty Bochane FSD2 server.

VRC 1.2.6 is the most recent version that still sends a plaintext password to the FSD server, making it highly compatible with openfsd. You can obtain it here (archive.org)

You will need to add an entry to the myservers.txt file. See the following snippet from the official VRC documentation:

Custom Server List

If you need to add servers to the list downloaded from VATSIM, you can create a custom servers file. This file is called myservers.txt and should be kept in your "My Documents\VRC" folder. Each line of this file represents a single custom server. The line must contain the server IP address or hostname, followed by a space, followed by a descriptive name for the server. The name will show up in the server list in the Connect window. Here's an example entry:

sweatbox.vatsim.net Public Sweatbox

Newer versions of VRC such as 1.3.0 use the new VATSIM fsd-jwt authentication system. The binary for these newer versions would need to be patched to call the openfsd fsd-jwt URL.

See here.

Some additional 3rd party work can be found here: github.com/Misaka-Nnnnq/openfsd-patch-for-es

TODO

1. In the Settings > Servers menu: Make a new server entry for openfsd with the correct address and port.
2. Select FSD (Private) for the "Eco." field
3. Select FSD [VATSIM] for the "Type" field.
4. In the FSD tab, enable the following flags (send and receive to TRUE):
   • "Parts"
   • "Gnd. flag"
   • "Send visual pos."
5. Leave the "Fast pos" flag unchecked.

See vPilot Patch Utility

See here.