> For the complete documentation index, see [llms.txt](https://docs.yourcontrols.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.yourcontrols.org/troubleshooting/general.md).

# General

### Missing DLL

Install [Microsoft Visual C++ Redistributable](https://aka.ms/vs/16/release/vc_redist.x64.exe) to resolve this.

### No message received from server

There are a number of causes this could be related to. 

1. Please ensure you have **allowed the program through your windows firewall and antivirus firewall**.
2. Some routers block incoming connections; if you know how to **configure your router**, try disabling the firewall or allowing incoming connections.
3. Otherwise, if you have a **mobile network you can switch to**, try that. 
4. If you are **using a VPN**, disable it. Conversely, if you are not using a VPN, a VPN may help.

### My copilot's aircraft is below or above me or in the ground

This is commonly due to mismatching sceneries. Please ensure you have the same add-on airports installed and that you're not at an airport that is handcrafted in one edition of the sim, but not in the other (Premium Deluxe vs Deluxe).

### My copilot's aircraft is in front or behind me

Disable multiplayer and make sure you *are not* in the same group. If you're using an online network such as VATSIM or IVAO, check out [VATSIM/IVAO](/vatsim-ivao.md) for more information. 

### Mismatching speeds/altitude

Unfortunately, weather cannot currently be synced between flight simulators. If the sea pressure, ISA, temperature, and other weather-related aspects are different, you will experience desync.