Is there an existing issue for this?
Is your issue described in the documentation?
Is your issue present in the latest beta/pre-release?
This issue is present in the latest pre-release
Describe the Bug
Environment Information
- Operating System: Windows Server 2025 with all latest updates
- Control System: Windows 11 with all latest updates
- Sunshine Version: latest stable (exact same version on both machines)
- Network Adapter: Realtek PCIe GbE Family Controller (identical hardware on both machines)
- Network Environment: Public IPv6, no NAT, Windows Defender Firewall completely disabled
- Runtime Mode: Desktop process (not service mode), running as full administrator
Problem Description
1. Symptoms:
- Client successfully connects to Sunshine via TCP port 47990, completes authentication and handshake
- Immediately after connection establishment, client throws error: Connection Terminated No video received from host
- Wireshark capture shows: only inbound UDP packets (client → server) on ports 47998/48000, no outbound UDP packets (server → client)
- All packets arrive intact at the server's network interface, but the server kernel never sends any UDP responses
2. Control Test Results:
- Exact same network environment, exact same Sunshine configuration, exact same client device
- Windows 11 machine works 100% correctly with bidirectional UDP traffic
- Windows Server 2025 machine reproduces the issue 100% of the time
Issues Already Ruled Out
✅ Firewall and port forwarding (Windows Defender Firewall completely disabled)
✅ IPv6 connectivity (TCP works perfectly, ping6 works)
✅ Sunshine configuration (IPv4+IPv6 enabled, listening on [::])
✅ Process permissions (running as full administrator, UserName displays correctly)
✅ IPv6 temporary addresses (both machines have SLAAC Privacy Level=2, Randomize Identifiers=enabled)
✅ Weak host mode (both machines have weakhostsend/weakhostreceive=enabled)
✅ UDP Segmentation Offload (USO) (both machines have IPv6 USO=enabled)
✅ Source address validation (DisableSourceValidation=1 has been set)
Expected Behavior
No response
Additional Context
No response
Host Operating System
Windows
Operating System Version
Windows server 2025
Architecture
amd64/x86_64
Package
Windows - exe installer
GPU Type
Intel
GPU Model
i3 n305 xe12
GPU Driver/Mesa Version
2025.12
Capture Method
Desktop Duplication API (Windows)
Apps
Log output
Online logs
No response
Is there an existing issue for this?
Is your issue described in the documentation?
Is your issue present in the latest beta/pre-release?
This issue is present in the latest pre-release
Describe the Bug
Environment Information
Problem Description
1. Symptoms:
2. Control Test Results:
Issues Already Ruled Out
✅ Firewall and port forwarding (Windows Defender Firewall completely disabled)
✅ IPv6 connectivity (TCP works perfectly, ping6 works)
✅ Sunshine configuration (IPv4+IPv6 enabled, listening on [::])
✅ Process permissions (running as full administrator, UserName displays correctly)
✅ IPv6 temporary addresses (both machines have SLAAC Privacy Level=2, Randomize Identifiers=enabled)
✅ Weak host mode (both machines have weakhostsend/weakhostreceive=enabled)
✅ UDP Segmentation Offload (USO) (both machines have IPv6 USO=enabled)
✅ Source address validation (DisableSourceValidation=1 has been set)
Expected Behavior
No response
Additional Context
No response
Host Operating System
Windows
Operating System Version
Windows server 2025
Architecture
amd64/x86_64
Package
Windows - exe installer
GPU Type
Intel
GPU Model
i3 n305 xe12
GPU Driver/Mesa Version
2025.12
Capture Method
Desktop Duplication API (Windows)
Apps
Log output
Online logs
No response