linux - arcanist / curl is unable to make ssl connections -

i use phabricator , arcanist in projects. works on long time, (after long break did) i'm unable use arcanis, if arcanist needs connect phabricator-server.

because arcanist uses curl communication, problem curl or ssl / ca question.

every time, try connect server using arc, following message:

 failed connect server (https://my.phabricator.host/api/):  [curl/77] (https://my.phabricator.host/api/conduit.ping) ssl ca  bundles tried use not read or not formatted  correctly. 

in last hours, tried different things:

1. downloading certificate browser (where https my.phabricator.host works , install certificate linux/ubuntu ca-store (/etc/ssl/certs/ / /usr/share/ca-certificates) using dpkg-reconfigure ca-certificates , on

2. using openssl connect host/download certificate, test if possible: works

3. trying arc install-certificates, results in same error above the ssl ca bundle....

4. setting my.phabricator.host blindly trust in arc-config.

...but error still exists.

hope find or hints here.