No player slots visible when I host MP, on all missions

[Snaper(S32)]

I'm running a non-dedicated server with a few friends. We've been playing for a long time, and yesterday I decided to run one of my old maps, from 2016 I believe. As soon as I host a game with that map, the bug happened:

None of the internet games I host, no matter which map I pick, UPNP or otherwise, shows any player slots. Player slots are visible when I host LAN. The only thing I did was try to run an old mission which uses no custom mods or scripts. I am at a complete loss. Our gaming nights are ruined..

Tried:
Confirming game cache
Reinstalling Arma 3
Deleting all maps and reinstalling

Should I never again be able to host multiplayer games, because I hosted this old map once? What is even the connection between the two events here? Halp.

[Gunter Severloh]

Its a mission and mod issue, no need to uninstall the game, verify cache, or anything else related.
Make sure all the mods your missions require are also loaded.
Make sure all the units in the mission you wish to play as are set to playable.
make sure there is a player in the mission.

Suggest providing an rpt so the community can review your logs, as the logs will tell you what the issue is.
You can locate the logs here: C:\Users\username\AppData\Local\Arma 3
You can open it with a notepad.

[Covid Bryant]

@Etirus,

Hey mate, doesn't the server automatically update with the rcent DLCs?

[Gunter Severloh]

Etrius님이 먼저 게시:

Got it, I put a truck from Contact into my mission. Server RPT says:

Warning Message: mpmissions/Escape%20Tanoa%20Eruption.Tanoa/mission.sqm/Mission/Entities/Item1087.type: Vehicle class B_T_Truck_01_flatbed_F no longer exists
1:07:12 Missing addons detected:
1:07:12 A3_Soft_F_Enoch_Truck_01
1:07:12 Warning Message: You cannot play/edit this mission; it is dependent on downloadable content that has been deleted.A3_Soft_F_Enoch_Truck_01
1:07:13 Mission Escape%20Tanoa%20Eruption.Tanoa: Missing 'description.ext::Header'

So the truck is missing then, seems your sever dont have the truck, basically reinstall the DLC on the server, or .... locate the file ----> A3_Soft_F_Enoch_Truck_01.pbo in the contact addons folder and upload that file, idk if that will work because it might depend on other files cant say but you'll need to update the server end, not a mission issue, its a DLC issue.