diff -dur gajim-1.0.3.orig/gajim/common/connection.py gajim-1.0.3/gajim/common/connection.py
--- gajim-1.0.3.orig/gajim/common/connection.py	2018-05-19 11:02:48.000000000 +0200
+++ gajim-1.0.3/gajim/common/connection.py	2018-08-16 17:13:33.261177953 +0200
@@ -1221,7 +1221,7 @@
 
         port = self._current_host['port']
 
-        cacerts = ''
+        cacerts = '/etc/certs/ca-certificates.crt'
         if os.name == 'nt':
             cacerts = certifi.where()
         mycerts = common.app.MY_CACERTS