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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](https://github.com/cern-fts/davix/blob/R_0_8_3/src/neon/neonsessionfactory.cpp#L45-L47)):
```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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