Problem: OX Upgrade fails

Problem

OX Update fails with “internal server error”
image

Environment

File /var/log/univention/updater.logshows:

26.03.20 23:10:21.219  MAIN        ( ERROR   ) : Interner Server-Fehler in "updater/updates/query".
Request: updater/updates/query

Traceback (most recent call last):
[...]
    for server, ver in self._iterate_component_repositories([component], version, version, self.architectures, for_mirror_list=for_mirror_list):
  File "/usr/lib/pymodules/python2.7/univention/updater/tools.py", line 1493, in _iterate_component_repositories
    for ver in self._iterate_versions(struct, version, version, parts, ['all'] + subarchs, server):
  File "/usr/lib/pymodules/python2.7/univention/updater/tools.py", line 1401, in _iterate_versions
    code, size, content = server.access(ver)
  File "/usr/lib/pymodules/python2.7/univention/updater/tools.py", line 708, in access
    raise ConfigurationError(uri, reason)
ConfigurationError: Configuration error: Das Netzwerk ist nicht erreichbar

Solution

Make sure your DNS is properly setup and the server in question can reach i.e. the host software.univention.de