On Wed, Dec 07, 2016 at 12:11:35PM +0100, Claus-Michael Schlesinger wrote:
> SSL error connecting mbox.uni-stuttgart.de (129.69.1.9:996): unable to get 
> local issuer certificate
> 
> Connecting with openssl s_client still works fine. 
>
this suggests that mbsync is for some reason using different defaults
than openssl.
are you sure that both link to the same libssl version? verify with ldd.
other than that, you can use ltrace/strace to find out where the
programs are looking for the CA certificate store.

to work around the issue, you can use get-cert to fetch the proxy's
certificate and put it into the CertificateFile option. this bypasses
the certificate chain verification on mbsync's side.

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