diff --git a/install/sql/incremental/upd_0078.sql b/install/sql/incremental/upd_0078.sql
new file mode 100644
index 0000000000000000000000000000000000000000..39b8c1ce9c89665247d7bea0de8a189bead019e3
--- /dev/null
+++ b/install/sql/incremental/upd_0078.sql
@@ -0,0 +1 @@
+ALTER TABLE  `web_domain` DROP INDEX `serverdomain`, ADD UNIQUE  `serverdomain` (  `server_id` , `ip_address`, `domain` );
\ No newline at end of file
diff --git a/install/sql/ispconfig3.sql b/install/sql/ispconfig3.sql
index 21c0644710c15d65b222943b388cc75de6176d17..bf68e5d7cbf70410b9263f7ea7657059d1df4319 100644
--- a/install/sql/ispconfig3.sql
+++ b/install/sql/ispconfig3.sql
@@ -1879,7 +1879,7 @@ CREATE TABLE `web_domain` (
   `added_date` date NOT NULL DEFAULT '0000-00-00',
   `added_by` varchar(255) DEFAULT NULL,
   PRIMARY KEY  (`domain_id`),
-  UNIQUE KEY `serverdomain` (  `server_id` ,  `domain` )
+  UNIQUE KEY `serverdomain` (  `server_id` , `ip_address`,  `domain` )
 ) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=1 ;
 
 -- --------------------------------------------------------
diff --git a/interface/lib/classes/validate_domain.inc.php b/interface/lib/classes/validate_domain.inc.php
index 988945df4c96caa4683b03b41d2cf48b3acc4e65..788b34bd60619963e0e55decbfbf438d9b7bc0a7 100644
--- a/interface/lib/classes/validate_domain.inc.php
+++ b/interface/lib/classes/validate_domain.inc.php
@@ -137,7 +137,8 @@ class validate_domain {
 		//if($check['cnt'] > 0) return false;
 
 		// we can have the same domain on different servers or different IPs, so we have to check for identical domains on the same IP (or wildcard IPs)
-		$checks = $app->db->queryAllRecords("SELECT * FROM `web_domain` WHERE (`domain` = '" . $app->db->quote($domain_name) . "'".$additional_sql1.") AND `server_id` = ".intval($domain['server_id'])." AND `domain_id` != " . $app->functions->intval($primary_id).($additional_sql1 != '' ? " AND `parent_domain_id` != ".$app->functions->intval($primary_id) : ""));
+		$checks = $app->db->queryAllRecords("SELECT * FROM `web_domain` WHERE (`domain` = '" . $app->db->quote($domain_name) . "'".$additional_sql1.") AND `server_id` = ".intval($domain['server_id'])." AND `domain_id` != " . $app->functions->intval($primary_id).($additional_sql1 != '' && $domain['parent_domain_id'] > 0 ? " AND `parent_domain_id` != ".$app->functions->intval($primary_id) : ""));
+		
 
 		if(is_array($checks) && !empty($checks)){
 			foreach($checks as $check){
@@ -207,7 +208,7 @@ class validate_domain {
 			//$check = $app->db->queryOneRecord("SELECT COUNT(*) as `cnt` FROM `web_domain` WHERE CONCAT(`subdomain`, '.', `domain`) = '" . $app->db->quote($domain_name) . "' AND `domain_id` != " . $app->functions->intval($primary_id));
 			//if($check['cnt'] > 0) return false;
 			// we can have the same domain on different servers or different IPs, so we have to check for identical domains on the same IP (or wildcard IPs)
-			$checks = $app->db->queryAllRecords("SELECT * FROM `web_domain` WHERE (CONCAT(`subdomain`, '.', `domain`) = '" . $app->db->quote($domain_name) . "'".$additional_sql2.") AND `server_id` = ".intval($domain['server_id'])." AND `domain_id` != " . $app->functions->intval($primary_id).($additional_sql2 != '' ? " AND `parent_domain_id` != ".$app->functions->intval($primary_id) : ""));
+			$checks = $app->db->queryAllRecords("SELECT * FROM `web_domain` WHERE (CONCAT(`subdomain`, '.', `domain`) = '" . $app->db->quote($domain_name) . "'".$additional_sql2.") AND `server_id` = ".intval($domain['server_id'])." AND `domain_id` != " . $app->functions->intval($primary_id).($additional_sql2 != '' && $domain['parent_domain_id'] > 0 ? " AND `parent_domain_id` != ".$app->functions->intval($primary_id) : ""));
 			if(is_array($checks) && !empty($checks)){
 				foreach($checks as $check){
 					if($domain['ip_address'] == '*') return false;