diff --git a/wo/cli/plugins/stack_pref.py b/wo/cli/plugins/stack_pref.py
index 0d2a58f..dff1e56 100644
--- a/wo/cli/plugins/stack_pref.py
+++ b/wo/cli/plugins/stack_pref.py
@@ -1076,6 +1076,8 @@ def post_pref(self, apt_packages, packages, upgrade=False):
             # add rule for proftpd with UFW
             if os.path.isdir('/etc/ufw'):
                 try:
+                    WOShellExec.cmd_exec(
+                        self, "ufw allow 21")
                     WOShellExec.cmd_exec(
                         self, "ufw allow 49000:50000/tcp")
                     WOShellExec.cmd_exec(