Port 28015 not working
I'm trying to setup a rust server, i do Port forwarding on Router and Firewall aswell,
But my only problem right now a server.port UDP 28015 not working, but Rcon 28016/TCP and Rust+ app 28083/TCP working fine . 
what can do ?
https://imgur.com/gallery/p4cI7M1
Make sure you do not have a hidden RustDedicated process running in the background from an improper server closure. You can check using Task Manager if on Windows.
5e13a8d5b2bc5.jpg Wulf
Make sure you do not have a hidden RustDedicated process running in the background from an improper server closure. You can check using Task Manager if on Windows.

Everything on task manager good but on CurrPorts, I find the UPD 28015 doesn't have Remote Adresse like TCP 28016! I do not know what to do (BTW Thanks for trying to help me) https://imgur.com/gallery/OzoRILi

According to your firewall, I don't see 28015 listed for the correct location. I see Rust SERVER, but it is not set to ANY like the others.
5e13a8d5b2bc5.jpg Wulf
According to your firewall, I don't see 28015 listed for the correct location. I see Rust SERVER, but it is not set to ANY like the others.screenshot

 Rust SERVER was just a rule for RustDedicated.exe to get all the port forwarding need, now I've deleted it, and I set up a new port forwarding rule.
But it's still not working so I disabled the firewall on the Router and Windows as well, I checked everything (see screenshot https://imgur.com/W3QJsRf ), and the same problem only TCP Ports works fine.
I think all UDP Ports not work for me, I don't know why
maybe ISP blocks UDP Ports.

screenshot :
1: Firewall off on router and windows
2: Rust port ford forwarding Rules

Hey,

I also got this problem right now.

My Rust server is installed on a Windows Server 2019 and ports are forwarded to the machine:

Port 28016 (RCON) and 28082 (App Port) are working fine but port 28015 isn't listening but it is formwarded to the machine.

If I use port scanner onto the IP and the ports everything works fine except the port 28015 cuz it isn't listening.

While checking the ports on my machine with netstat -aon 28016 and 28082 are normally listening with the PID of RustDedicated.exe but port 28015 isn't listening but also is used by the PID of RustDedicated.exe

So it seems as if RustDedicated.exe isn't answering on the port 28015

I've also tried to use different ports but it is always the same and I don't know why this happens?

You can work out what the problem is by a process of elimination:

1. Check to make sure you can join the server via your local ip address on your in-game F1 console, eg. "connect 192.168.x.x:28015". Checking it using the game client is better than messing around with port scanning. If you can't connect then it's a problem with your rustserver setup and nothing to do with #2 or #3
2. Completely disable your firewall. If you can join via the external IP with firewall off, then you know the firewall is not configured properly.
3. If you can't join via external IP with firewall off then you have a port forwarding issue. Make sure the port number 28015 matches in both the rustserver config and the 'local port' setting in the router port forwarding config. It should be UDP protocol.