This is not an issue specific to your patcher. I get this with and without your fixes applied.

This error message appears every time i make an attempt to connect to a locally hosted dedicated server, and also when creating a LAN match directly from the game. I have not tried to connect to remote servers.

There's no trace of a connection attempt in the server output.
Though interestingly enough, the dedicated server is listed in the game when scanning for LAN matches.

The server and the client run from the same installation.

Perhaps you can shed light on this. Research on the net left me where i started.

Earning more than 1500 XP in a single match, the exceeding amount will be deducted from total XP - still, everything else is recorded (kills, progress on manuals). Though barely anyone has reached that point with the new backend, removing it would allow us to have Double XP Weekends, which would attract more players and helps keeping their interest in Ranked - also, the returning players who had reached, or was nearly rank 30 on Ubisoft's Official Backend, they start from scratch again - it would help them catch up a little.
I think that would be a fun element to have. - Tatu

The Custom map community server not working for uploading or downloading maps.

This seems to be an issue on Ubisoft's end, maybe lack of a valid token or something?
The server responsible for uploads and downloads thru HTTP is just responding with 403 Forbidden.

Introduction

When joining servers running custom maps, players are unable to download maps.

This is due to mismatch between the advertised IP address by clients and the server and their actual addresses because of being behind a NAT instance.

There is a community map download server that functions as a mitigation to this issue, but properly logging into it requires further specific setup, not to be covered in this issue.

Research already known prior to [09.02.2020]

• When clients connect to a server, their local IP address is sent inside the packet and is sadly used by the server for multiple purposes.
• Downloads work when connecting to the server over LAN due to no NAT instance being in between.
• The server maintains an allow list of which IP addresses to accept download requests from.
• The allow list automatically adds clients that did properly connect to the server, and serves the purpose of denying access to other random clients not in-game.
• Clients somehow receives a response to the custom map download request instructing them to connect to the wrong IP address.

Research done after [09.02.2020]

• The allow list actually does not prevent clients from downloading the map due to the issue of sending the local IP address, as it sends the local IP both when initially added, and when checking against the allow list.

Possible solutions

Far Cry 2 is does indeed poorly implement service when used in conjunction with NAT, that is even with NAT traversal specific code found in the executable.

According to this research it seems like this issue is solvable using only a server side patch.

Required to resolve the issue

• [Server] Inject code to retrieve the actual public IP address of the server and set it before sending the custom map download response back to the client, ensuring that the client connects to the right IP address.

Also this should be fixed as it MAY introduce undefined behavior if two clients ends up having the same local IP address.

• [Server] Hijacking the function handling the packet initially sent to the server, and reading the public IP address that is known from the actual connection into the data structure supposed to contain the wrong IP address sent inside the packet received from the client.

This is probably due to the detection if the public IP address in the server without taking the possibility of LAN play into account, in this case we should do nothing.

Fix crash if not all files exists.
Happens if either Dunia.dll or FC2DedicatedServer doesn't exist.

Probably the game-id is handled differently on Ubisoft's end for the Steam and Uplay editions, than for the retail edition.

Several commands, basically to chat privately or kick/ban players require the use of a name or id. Whenever it doesn't exist (yet), you get a general error player not found. This makes it hard to see which failed when you execute multiple id/name related commands. So request: Add the used id/name to the errormessage so it's clear which used command(s) failed.

Fix HTTP map downloads for Retail version, currently it can be workaround-ed by using old winhttp.dll that is compatible with it.

We should look into just patching the API calls to winhttp and adapt them to the new winhttp.dll for the Retail version.

Add informational message box about registering an account at farcry2.online after successful patching

Hi not sure where to send this but you seem to know how FC server and client are communicating. Ubisoft recently closed down their MP online service for FC3 and will never come back again, is it possible to build a similar service for FC3 so players can play online again ? Many people think it’s the best team deathmatch game ever made.

I’m happy to support any way I can, there are more people that can support.

In the Win 11 operating system, when running the FC2MPPatcher application, fc2mppatcher.exe cannot be opened, it writes an error - it is impossible to run this application on your PC.

Please recompile and compile the .exe version of the application for the current version of Windows 11

Windows 11 Enterprise 22H2
OS build: 22621.2428
Interoperability: Windows Feature Experience Pack 1000.22674.1000.0

Add support for Epic Games version of Far Cry 2

Prevent patching if FarCry2, FC2DedicatedServer or FC2Editor is running, and tell the user what went wrong and how to solve it by making sure these processes do not run.