Comment # 1 on bug 1192433 from Michael Andres

Dimitry, please 

   export ZYPP_MEDIA_CURL_DEBUG=2

Do _not_ set ZYPP_MEDIA_CURL_IPRESOLVE and let a few errors occur. Then attach
the /var/log/zypper.log here. We'll check the log then. Maybe they reveal
soemthing, but it may also be an issue in your IPV6 environment.