diff --git a/ucs-4.0-1/base/univention-system-setup/umc/python/setup/__init__.py b/ucs-4.0-1/base/univention-system-setup/umc/python/setup/__init__.py
index 0efbd48..89be060 100644
--- a/ucs-4.0-1/base/univention-system-setup/umc/python/setup/__init__.py
+++ b/ucs-4.0-1/base/univention-system-setup/umc/python/setup/__init__.py
@@ -386,7 +386,7 @@ def _append(key, message):
 
 		# host and domain name
 		packages = set(values.get('components', []))
-		_check('hostname', util.is_hostname, _('The hostname is not a valid fully qualified domain name in lowercase (e.g. host.example.com).'))
+		_check('hostname', util.is_hostname, _('The hostname is not a valid fully qualified domain name (e.g. host.example.com).'))
 		_check('hostname', lambda x: len(x) <= 13, _('A valid NetBIOS name can not be longer than 13 characters. If Samba is installed, the hostname should be shortened.'), critical=('univention-samba' in packages or 'univention-samba4' in packages))
 		_check('domainname', util.is_domainname, _("Please enter a valid fully qualified domain name in lowercase (e.g. host.example.com)."))
 		hostname = allValues.get('hostname', '')
diff --git a/ucs-4.0-1/base/univention-system-setup/umc/python/setup/de.po b/ucs-4.0-1/base/univention-system-setup/umc/python/setup/de.po
index efb4f8e..9964938 100644
--- a/ucs-4.0-1/base/univention-system-setup/umc/python/setup/de.po
+++ b/ucs-4.0-1/base/univention-system-setup/umc/python/setup/de.po
@@ -159,8 +159,8 @@ msgstr "Der folgende Wert ist zu lang, es sind nur 64 Zeichen erlaubt: %s"
 msgid "The given user is not member of the Domain Admins group in Active Directory. This is a requirement for the Active Directory domain join."
 msgstr "Der angegebene Benutzer ist kein Mitglied der Gruppe Domain Admins im Active Directory. Dies ist eine Voraussetzung für den Active Directory Domänenbeitritt."
 
-msgid "The hostname is not a valid fully qualified domain name in lowercase (e.g. host.example.com)."
-msgstr "Der Rechnernamen muss vollständig und klein geschrieben sein (z.B. host.example.com)."
+msgid "The hostname is not a valid fully qualified domain name (e.g. host.example.com)."
+msgstr "Der Rechnername ist kein gültiger FQDN (z.B. host.example.com)."
 
 msgid "The length of fully qualified domain name is greater than 63 characters."
 msgstr "Die Länge von System- und Domänennamen ist größer als 63 Zeichen."
diff --git a/ucs-4.0-1/base/univention-system-setup/umc/python/setup/util.py b/ucs-4.0-1/base/univention-system-setup/umc/python/setup/util.py
index da315fb..e4c3899 100644
--- a/ucs-4.0-1/base/univention-system-setup/umc/python/setup/util.py
+++ b/ucs-4.0-1/base/univention-system-setup/umc/python/setup/util.py
@@ -710,7 +710,7 @@ def is_ipv6netmask(addr_netmask):
 
 def is_hostname(hostname):
 	return is_hostname.RE.match(hostname) is not None
-is_hostname.RE = re.compile("^[a-z]([a-z0-9-]*[a-z0-9])*$")
+is_hostname.RE = re.compile("^[a-z]([a-z0-9-]*[a-z0-9])*$", re.IGNORECASE)
 
 def is_domainname(domainname):
 	"""