diff -Naur mantisbt-1.2.3/admin/install.php mantisbt-patch/admin/install.php
--- mantisbt-1.2.3/admin/install.php	2010-10-22 16:24:23.000000000 +0200
+++ mantisbt-patch/admin/install.php	2010-10-22 16:25:47.000000000 +0200
@@ -292,6 +292,11 @@
 	$g_db = ADONewConnection( $f_db_type );
 	$t_result = @$g_db->Connect( $f_hostname, $f_admin_username, $f_admin_password );
 
+	# Second chance
+	if( !$t_result ) {
+		$t_result = @$g_db->Connect( $f_hostname, $f_admin_username, $f_admin_password, $f_database_name );
+	}
+
 	if( $t_result ) {
 
 		# check if db exists for the admin