diff --git a/install/install.php b/install/install.php
index 8b320271c7434c57cb48a9a681101e14e440c168..c9f6545190825c1c7b613e3084c4acf6e7c4d1a2 100644
--- a/install/install.php
+++ b/install/install.php
@@ -203,7 +203,7 @@ do {
 	}
 
 	//* Initialize the MySQL server connection
-	if(@mysql_connect($tmp_mysql_server_host, $tmp_mysql_server_admin_user, $tmp_mysql_server_admin_password, (int)$tmp_mysql_server_port)) {
+	if(@mysql_connect($tmp_mysql_server_host . ':' . (int)$tmp_mysql_server_port, $tmp_mysql_server_admin_user, $tmp_mysql_server_admin_password)) {
 		$conf['mysql']['host'] = $tmp_mysql_server_host;
 		$conf['mysql']['port'] = $tmp_mysql_server_port;
 		$conf['mysql']['admin_user'] = $tmp_mysql_server_admin_user;
@@ -543,7 +543,7 @@ if($install_mode == 'standard') {
 			$tmp_mysql_server_database = $inst->free_query('MySQL master server database name', $conf['mysql']['master_database'],'mysql_master_database');
 
 			//* Initialize the MySQL server connection
-			if(@mysql_connect($tmp_mysql_server_host, $tmp_mysql_server_admin_user, $tmp_mysql_server_admin_password, (int)$tmp_mysql_server_port)) {
+			if(@mysql_connect($tmp_mysql_server_host . ':' . (int)$tmp_mysql_server_port, $tmp_mysql_server_admin_user, $tmp_mysql_server_admin_password)) {
 				$conf['mysql']['master_host'] = $tmp_mysql_server_host;
 				$conf['mysql']['master_port'] = $tmp_mysql_server_port;
 				$conf['mysql']['master_admin_user'] = $tmp_mysql_server_admin_user;
diff --git a/install/update.php b/install/update.php
index 97b28fdf54905b8b1147cbd8bb2080a92bb435db..1fec2cccb106ab41a00fb2b47da1bf272665c5b0 100644
--- a/install/update.php
+++ b/install/update.php
@@ -253,7 +253,7 @@ if($conf['mysql']['master_slave_setup'] == 'y') {
 		$tmp_mysql_server_database = $inst->free_query('MySQL master server database name', $conf['mysql']['master_database'],'mysql_master_database');
 
 		//* Initialize the MySQL server connection
-		if(@mysql_connect($tmp_mysql_server_host, $tmp_mysql_server_admin_user, $tmp_mysql_server_admin_password, (int)$tmp_mysql_server_port)) {
+		if(@mysql_connect($tmp_mysql_server_host . ':' . (int)$tmp_mysql_server_port, $tmp_mysql_server_admin_user, $tmp_mysql_server_admin_password)) {
 			$conf['mysql']['master_host'] = $tmp_mysql_server_host;
 			$conf['mysql']['master_port'] = $tmp_mysql_server_port;
 			$conf['mysql']['master_admin_user'] = $tmp_mysql_server_admin_user;
diff --git a/interface/lib/classes/db_mysql.inc.php b/interface/lib/classes/db_mysql.inc.php
index 08a224f599ac313b7d03e09a4a8639c9762c26d2..a4d4b33d9c9142642b90a4c6173320217b563d73 100644
--- a/interface/lib/classes/db_mysql.inc.php
+++ b/interface/lib/classes/db_mysql.inc.php
@@ -76,13 +76,13 @@ class db extends mysqli
 		$this->dbNewLink = $conf[$prefix.'db_new_link'];
 		$this->dbClientFlags = $conf[$prefix.'db_client_flags'];
 
-		$this->_iConnId = mysqli_connect($this->dbHost, $this->dbUser, $this->dbPass, (int)$this->dbPort);
+		$this->_iConnId = mysqli_connect($this->dbHost, $this->dbUser, $this->dbPass, '', (int)$this->dbPort);
 		$try = 0;
 		while((!is_object($this->_iConnId) || mysqli_connect_error()) && $try < 5) {
 			if($try > 0) sleep(1);
 
 			$try++;
-			$this->_iConnId = mysqli_connect($this->dbHost, $this->dbUser, $this->dbPass, (int)$this->dbPort);
+			$this->_iConnId = mysqli_connect($this->dbHost, $this->dbUser, $this->dbPass, '', (int)$this->dbPort);
 		}
 
 		if(!is_object($this->_iConnId) || mysqli_connect_error()) {
diff --git a/server/lib/classes/db_mysql.inc.php b/server/lib/classes/db_mysql.inc.php
index bf4351974cda72b4efc7f335c827a08fef1ec767..a7b879174f91987111f74d988b4e0fc35a2c43c8 100644
--- a/server/lib/classes/db_mysql.inc.php
+++ b/server/lib/classes/db_mysql.inc.php
@@ -76,13 +76,13 @@ class db extends mysqli
 		$this->dbNewLink = $conf['db_new_link'];
 		$this->dbClientFlags = $conf['db_client_flags'];
 
-		$this->_iConnId = mysqli_connect($this->dbHost, $this->dbUser, $this->dbPass, (int)$this->dbPort);
+		$this->_iConnId = mysqli_connect($this->dbHost, $this->dbUser, $this->dbPass, '', (int)$this->dbPort);
 		$try = 0;
 		while((!is_object($this->_iConnId) || mysqli_connect_error()) && $try < 5) {
 			if($try > 0) sleep(1);
 
 			$try++;
-			$this->_iConnId = mysqli_connect($this->dbHost, $this->dbUser, $this->dbPass, (int)$this->dbPort);
+			$this->_iConnId = mysqli_connect($this->dbHost, $this->dbUser, $this->dbPass, '', (int)$this->dbPort);
 		}
 
 		if(!is_object($this->_iConnId) || mysqli_connect_error()) {