Hello,

I'll comment from the FTS side.

Going by @abh3 latest statement, I'm not yet convinced:

That this is a Davix problem and Davix only works when DAVIX_DISABLE_SESSION_CACHING=true and it does not matter what the server's setting is in that case.

Davix session caching is enabled by default. To disable it, one has to set the DAVIX_DISABLE_SESSION_CACHING variable. The value does not matter (davix/neonsessionfactory.cpp):

static bool isSessionCachingDisabled(){
  return ( getenv("DAVIX_DISABLE_SESSION_CACHING") != NULL);
}

Leaving outside on why Davix only checks if the variable is set or not (and not the actual value), this means the previous table now turns into:

client	server	works?
DAVIX_DISABLE_SESSION_CACHING set	http.tlsreuse missing	no
DAVIX_DISABLE_SESSION_CACHING set	http.tlsreuse missing	yes
DAVIX_DISABLE_SESSION_CACHING set	http.tlsreuse on	no
DAVIX_DISABLE_SESSION_CACHING set	http.tlsreuse on	yes
DAVIX_DISABLE_SESSION_CACHING set	http.tlsreuse off	yes
DAVIX_DISABLE_SESSION_CACHING unset	http.tlsreuse off	no

To me, this looks like noise (previously, ~38% failing transfers failing, were mentioned).
If the session caching had a definitive effect, we should've seen it.

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