diff --git a/apps/user_ldap/group_ldap.php b/apps/user_ldap/group_ldap.php
index 591ba41253..34141e51f4 100755
--- a/apps/user_ldap/group_ldap.php
+++ b/apps/user_ldap/group_ldap.php
@@ -46,7 +46,12 @@ class OC_GROUP_LDAP extends OC_Group_Backend {
 		if(!$dn_group || !$dn_user) {
 			return false;
 		}
-		$members = OC_LDAP::readAttribute($dn_group, $this->ldapGroupMemberAssocAttr);
+		//usually, LDAP attributes are said to be case insensitive. But there are exceptions of course.
+		$read = ($members = OC_LDAP::readAttribute($dn_group, $this->ldapGroupMemberAssocAttr))
+			||  ($members = OC_LDAP::readAttribute($dn_group, strtolower($this->ldapGroupMemberAssocAttr)));
+		if(!$read) {
+			return false;
+		}
 
 		//extra work if we don't get back user DNs
 		//TODO: this can be done with one LDAP query
@@ -96,6 +101,11 @@ class OC_GROUP_LDAP extends OC_Group_Backend {
 			$this->ldapGroupMemberAssocAttr.'='.$uid
 		));
 		$groups = OC_LDAP::fetchListOfGroups($filter, array(OC_LDAP::conf('ldapGroupDisplayName'),'dn'));
+		if(count($groups) == 0) {
+			//usually, LDAP attributes are said to be case insensitive. But there are exceptions... So we try it once more
+			$filter = str_replace($this->ldapGroupMemberAssocAttr, strtolower($this->ldapGroupMemberAssocAttr), $filter);
+			$groups = OC_LDAP::fetchListOfGroups($filter, array(OC_LDAP::conf('ldapGroupDisplayName'),'dn'));
+		}
 		$userGroups = OC_LDAP::ownCloudGroupNames($groups);
 
 		return array_unique($userGroups, SORT_LOCALE_STRING);
@@ -110,7 +120,14 @@ class OC_GROUP_LDAP extends OC_Group_Backend {
 		if(!$groupDN) {
 			return array();
 		}
-		$members = OC_LDAP::readAttribute($groupDN, $this->ldapGroupMemberAssocAttr);
+
+		//usually, LDAP attributes are said to be case insensitive. But there are exceptions of course.
+		$read = ($members = OC_LDAP::readAttribute($groupDN, $this->ldapGroupMemberAssocAttr))
+			||  ($members = OC_LDAP::readAttribute($groupDN, strtolower($this->ldapGroupMemberAssocAttr)));
+		if(!$read) {
+			return array();
+		}
+
 		$result = array();
 		foreach($members as $member) {
 			if(strtolower($this->ldapGroupMemberAssocAttr) == 'memberuid') {