[tor-relays] Re: Standalone snowflake proxy re-testing as restricted

[0x5fcfbd30--- via tor-relays <tor-relays@xxxxxxxxxxxxxxxxxxxx>]

Cecylia Bocovich wrote:
> We've had several reports about the NAT check being inconsistent since 
> we upgraded and re-installed the Snowflake broker[0], it seems it's not 
> just you having this problem. I've opened an issue to look into it[1]. 

Thanks for the confirmation. Meanwhile, I was getting verbose logging while doing several restarts. Most of them ended up in a timeout waiting for the probe test to open a data channel:

2024/11/29 19:29:48 Waiting for a test WebRTC connection with NAT check probe server to establish...
2024/11/29 19:29:48 NAT check: WebRTC: OnConnectionStateChange: connecting
2024/11/29 19:29:49 NAT check: WebRTC: OnConnectionStateChange: connected
2024/11/29 19:29:49 WebRTC: DataChannel.OnClose
2024/11/29 19:29:49 NAT check: WebRTC: OnConnectionStateChange: closed

while a successful attempt logs like that:
2024/11/29 19:16:38 Waiting for a test WebRTC connection with NAT check probe server to establish...
2024/11/29 19:16:38 NAT check: WebRTC: OnConnectionStateChange: connecting
2024/11/29 19:16:39 NAT check: WebRTC: OnConnectionStateChange: connected
*2024/11/29 19:16:39 WebRTC: DataChannel.OnOpen*
2024/11/29 19:16:39 Test WebRTC connection with NAT check probe server established! This means our NAT is unrestricted!
2024/11/29 19:16:39 NAT Type measurement: unknown -> unrestricted
2024/11/29 19:16:39 WebRTC: DataChannel.OnClose
2024/11/29 19:16:39 NAT type: unrestricted
2024/11/29 19:16:39 NAT check: WebRTC: OnConnectionStateChange: closed

To me this looks like webRTC connection is successful, however, DataChannel never reaches the OnOpen but straight the OnClose signal. Looking through the proxy code, I have no idea, why that could happen, but I'm by no means an expert in WebRTC.
Anyway, I hope it helps to diagnose the problem further. Meanwhile, I disabled rechecking and simply try until I get lucky during the NAT testing.
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