Pairing reports success but Moonlight remains unauthorized until all paired clients are cleared (v2026.906.222525)

[CaiKerman]

Sunshine version

v2026.906.222525

Host environment

Windows host running Sunshine.

Client

Moonlight on a phone.

Problem

After upgrading Sunshine to v2026.906.222525, pairing a new Moonlight device could appear to succeed in the Sunshine Web UI, but the Moonlight client would still fail immediately afterward with an authorization / certificate verification error similar to:

Host PC returned error: The client is not authorized. Certificate verification ...

The Sunshine PIN page reported success, so from the host side the pairing looked completed, but the client was not actually authorized.

Steps that reproduced the issue

1. Sunshine already had one or more paired clients.
2. Start pairing from a new Moonlight client.
3. Moonlight displays a PIN.
4. Enter that PIN in the Sunshine Web UI.
5. Sunshine Web UI reports the pairing as successful.
6. Moonlight still fails with The client is not authorized / certificate verification error.
7. Restarting Sunshine and forgetting/re-adding the host in Moonlight did not resolve it.

Workaround that fixed it

In Sunshine:

Troubleshooting -> Unpair Clients -> Unpair All

After clearing all existing paired clients, pairing the same Moonlight device again succeeded normally.

Expected behavior

A new client should be able to pair successfully without requiring all existing paired clients to be deleted. If the final certificate authorization fails, the Web UI also should not report the pairing as successful.

Additional observation

The fact that Unpair All immediately fixes the problem suggests that stale, duplicate, or otherwise conflicting client certificate/authorization records may be involved. It may be worth checking how existing named_devices / authorized client certificates are matched and updated during a new pairing operation.

I can provide additional logs or inspect sunshine_state.json if that would help narrow this down.

[CaiKerman]

Additional minimal log evidence from the failing state (personal/network details omitted):

[2026-09-13 01:10:32.298]: Warning: SSL Verification error :: Client certificate identity is not enabled
[2026-09-13 01:11:08.839]: Warning: SSL Verification error :: Client certificate identity is not enabled

After Troubleshooting -> Unpair Clients -> Unpair All, pairing the same Moonlight client again succeeded and Sunshine then logged a normal client connection.

This seems to narrow the failure to the stored client authorization/certificate state rather than network connectivity.

[ReenigneArcher]

Maybe already fixed by #5680, available in beta/pre-release. Please check and let me know.

[kingten62b]

The same issue occurred in 2026.915.130146. I have rolled back to 2026.516.143833, and the problem is resolved.

[ReenigneArcher]

Can you guys try the builds listed at #5737 (comment) and let me know if it solves your issue?

[CaiKerman]

Thanks for the update! Sorry, I’m traveling for work and can’t test it right now. Hopefully someone else with the same issue can try the new build and confirm whether it’s fixed.

[DeltaKbyte]

I had the same issue, but it seems to be fixed in #5737! ✅
I paired all my devices on build #5737, then reinstalled the stable build, and everything is working fine now.