diff --git a/base/univention-system-setup/umc/python/setup/util.py b/base/univention-system-setup/umc/python/setup/util.py
index 92aacc1..a2edfcd 100644
--- a/base/univention-system-setup/umc/python/setup/util.py
+++ b/base/univention-system-setup/umc/python/setup/util.py
@@ -1091,7 +1091,8 @@ def domain_has_activated_license(nameserver, username, password):
 		client = Client(fqdn_master, username, password)
 		result = client.umc_command('udm/license/info').result
 	except (HTTPError, ConnectionError) as exc:
-		raise UMC_Error(str(exc))
+		MODULE.error('Failed request: %s' % (exc,))
+		raise UMC_Error(_('The domaincontroller master could not be contacted. Please check if the host is up and reachable, especially by proxy and firewall.'))
 
 	return bool(result.get('keyID'))