From 34c358e96e088b6426fdcd14c34cc5bc890b4045 Mon Sep 17 00:00:00 2001 From: Benedikt Rollik Date: Thu, 30 Jan 2025 11:10:53 +0100 Subject: [PATCH] fix(tuto): fix issue with protocol specification --- tutorials/installation-uncomplicated-firewall/index.mdx | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/tutorials/installation-uncomplicated-firewall/index.mdx b/tutorials/installation-uncomplicated-firewall/index.mdx index 7f3c1a7c82..e389672ea9 100644 --- a/tutorials/installation-uncomplicated-firewall/index.mdx +++ b/tutorials/installation-uncomplicated-firewall/index.mdx @@ -9,7 +9,7 @@ tags: Firewall UFW port-25 categories: - instances dates: - validation: 2024-12-13 + validation: 2025-01-30 posted: 2018-07-18 --- @@ -129,9 +129,13 @@ As the firewall is running now, it is possible to add more rules to it: Allow the connection to port 25 (SMTP) via TCP to the server: ```code -sudo ufw allow 25/TCP +sudo ufw allow 25/tcp ``` + + The protocol specification (`tcp`) is case-sensitive. Make sure to use only lowercase letters when specifying the protocol. + + ## Deleting rules Over time, you may recognize that some of the rules you defined previously do not match your requirements anymore.