diff --git a/adminer/drivers/mongo.inc.php b/adminer/drivers/mongo.inc.php
index ba0a4ac4..b63be606 100644
--- a/adminer/drivers/mongo.inc.php
+++ b/adminer/drivers/mongo.inc.php
@@ -600,6 +600,11 @@ if (isset($_GET["mongo"])) {
 		global $adminer;
 		$connection = new Min_DB;
 		list($server, $username, $password) = $adminer->credentials();
+
+		if ($server == "") {
+			$server = "localhost:27017";
+		}
+
 		$options = array();
 		if ($username . $password != "") {
 			$options["username"] = $username;
diff --git a/adminer/drivers/mssql.inc.php b/adminer/drivers/mssql.inc.php
index ac0fa4a0..f6990c13 100644
--- a/adminer/drivers/mssql.inc.php
+++ b/adminer/drivers/mssql.inc.php
@@ -303,6 +303,11 @@ if (isset($_GET["mssql"])) {
 		global $adminer;
 		$connection = new Min_DB;
 		$credentials = $adminer->credentials();
+
+		if ($credentials[0] == "") {
+			$credentials[0] = "localhost:1433";
+		}
+
 		if ($connection->connect($credentials[0], $credentials[1], $credentials[2])) {
 			return $connection;
 		}