>Is there a technical spec of that protocol? Does it look in any way like 
>HaProxy protocol version 1 or 2? What are the source IP address and port?
https://nginx.org/en/docs/stream/ngx_stream_proxy_module.html#:~:text=Enables%20the%20PROXY%20protocol
 links to the expected suspect (HaProxy)...
IIRC last time I tested only v1 was supported. I.e. yes, HaProxy v1, but this 
may have changed.
As source I am passing external addresses (ipv4 in ipv6 style or true ipv6, 
always matching the target/server address family in same format) of one of my 
VPS, and nginx chooses a dynamic source port.
Joachim


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