Unturned server works via Server Code, but not direct IP/browser
OS Name/Version:
Windows 11 Home 64-bit
Product Name/Version:
AMP Release “Callisto” v2.6.0.6
Unturned 3.26.3.2
Problem Description:
I am hosting an Unturned dedicated server through AMP on a dedicated Windows 11 machine. The server launches correctly, authenticates with Steam successfully, and external users CAN connect through the generated relay/server code. However:
- Direct IP connections fail
- Steam favorites cannot find the server
- The server never appears in the public browser/server list
- Browser searching by server name does not work even after several hours online
The server logs show successful Steam initialization and GSLT authentication:
Successfully set port to 27015!
Successfully set game server login token.
Successfully set name to BluDrift Test Server!
Steam servers ready!
The server is configured as:
- Game port: 27015 UDP
- Query port: 27016 UDP
I have confirmed:
- Server binds/listens correctly via
netstat - Public IPv4 exists
- Port forwards are configured (27015-20 UDP)
- Relay/server-code connections work externally
- UDP traffic reaches the machine and replies outbound (confirmed in Wireshark)
Despite all of this:
- Steam favorites says:
​
Did not find any servers at that address
- Direct IP connect fails
- Public browser listing never appears
Steps to reproduce:
Step 1
Create a fresh Unturned instance in AMP using the default template.
Step 2
Configure:
- Valid GSLT
- Game port 27015
- Query port 27016
- Public server name
- Port forwards in router
Step 3
Launch the server and attempt:
- Steam favorites add via IP:Port
- Direct IP connect
- Public browser search
Actions taken to resolve so far:
- Fully rebuilt the AMP instance from scratch
- Fully reset router and rebuilt port forwards
- Confirmed stable LAN IP:
​
192.168.40.192
- Confirmed public IP
- Confirmed DNS resolution through Cloudflare DNS-only mode (gray cloud) (only for when testing domain server link, also tried direct public IP)
- Confirmed UPnP enabled
- Tested with Windows Firewall and Defender completely disabled
- Confirmed listeners via:
​
netstat -ano | findstr 27015
netstat -ano | findstr 27016
- Confirmed bidirectional UDP traffic in Wireshark between external Steam infrastructure and the server on port 27015
- Confirmed external hotspot testing still fails for direct IP connection
- Tested both:
​
27015/27016
and:
27015/27015
- Restarted:
- AMP
- Unturned instance
- Server PC
- Router
- Verified:
​
Steam servers ready!
appears successfully in logs
At this point I am trying to determine whether this is:
- An AMP Unturned runtime/query registration issue
- A modern Steam Datagram Relay vs direct query issue
- An Unturned server advertisement issue
- Or some router/ISP behavior specific to Steam query traffic despite confirmed UDP flow
I am 4 hours in and about ready to throw the towel as this went downhill very fast. Any info would be appreciated. I also read Rocket may be the issue, but I am unsure how to prevent that from installing as AMP installs automatically. I will be testing a full standalone version of Unturned Server off of AMP tomorrow, but would love to avoid an external environment. Thank you for any help.