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@mpatrascoiu 

>To me, this looks like noise (previously, ~38% of transfers failing was mentioned).

Yes, that value is at 75% right now (failures).
Most of the successful transfers do not use `davs://` but seem to start with `srm://` or `https://`.
But I also found 1 working example with both endpoints using `davs://`:
https://fts3-cms.cern.ch:8449/fts3/ftsmon/#/job/44192334-4ada-11ed-a5ba-fa163e252af3

Manual tests ALWAYS fail if `DAVIX_DISABLE_SESSION_CACHING` is unset. In the original table I assumed `DAVIX_DISABLE_SESSION_CACHING=false` was the default value. The correct table is


client | server | dst protocol |  works?
-- | -- | -- | --
DAVIX_DISABLE_SESSION_CACHING unset | http.tlsreuse on, off, or missing | `davs://` | no
DAVIX_USE_LIBCURL=1 | http.tlsreuse on, off, or missing | `davs://` | no
-- | -- | -- | --
DAVIX_DISABLE_SESSION_CACHING set | http.tlsreuse on, off, or missing | `davs://` | yes
DAVIX_DISABLE_SESSION_CACHING unset | http.tlsreuse on, off, or missing | `https://` | yes
DAVIX_USE_LIBCURL=1 | http.tlsreuse on, off, or missing | `https://` | yes

It seems that switching `davs://` → `https://` immediately improves the situation (or setting `DAVIX_DISABLE_SESSION_CACHING`).




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