Hi,

thanks for the update.

[...]

Have you sent/tested any other request to the sabre/dav through nginx?
And if so, could you share a result in from the nginx logfile.

Also, let's return back to the request:
201.48.168.101 - - [08/Mar/2022:14:00:38 +0000] "OPTIONS / HTTP/1.1" 405 182 "-" "WinSCP/5.19.6 neon/0.31.2"

At first look that's the problem with the application backend, i.e.
sabre/dav, but in any cases is there any chance to enable debugging log
as it's described https://nginx.org/en/docs/debugging_log.html, send
a request once again and share the log file.

--
Sergey A. Osokin
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