# Add or change a firewall rule

> The form for a new or changed rule in one of your company's firewalls.

Source: https://docs.incabus.com/en/cloud/cloud-server/firewalls/rule/

Last updated 12 Oct 2026

This page adds a rule to a firewall, or changes an existing one. You come
here from [Firewalls](https://docs.incabus.com/en/cloud/cloud-server/firewalls/) — the button below a table
for a new rule, the pen on a row to change one.

*Screenshot: Add an inbound rule*

At the top it says which firewall it is and which servers it protects. If
you are changing a rule, it also shows how the rule looks today.

## Fill in the rule

1. **Type** — what the rule is for. Choose a common service and the
   protocol and port are filled in for you: **SSH** (22), **HTTP** (80),
   **HTTPS** (443), **RDP** (remote desktop, 3389), **MySQL** (3306),
   **PostgreSQL** (5432), **MongoDB** (27017), **DNS TCP** and
   **DNS UDP** (53), or **All TCP**, **All UDP** and **ICMP** (for
   example ping). Choose **Custom** for anything else.
2. **Protocol** and **Ports** — filled in by the type, and locked then.
   With **Custom** you choose yourself: TCP, UDP or ICMP, and one port or
   a range such as *8000-9000*. ICMP has no ports.
3. **From** or **To** — where traffic may come from, or go to. Type an
   address or network, such as *203.0.113.5* or *198.51.100.0/24*, and
   press Enter or comma, or choose **All addresses** or one of your own
   servers in the list that appears. Each choice becomes a small label in
   the field, and addresses and servers can be mixed in one rule. The
   cross on a label removes it. If you paste several addresses at once,
   each becomes a label of its own.

Choose **Add rule** or **Save the change** and confirm. You then return to
the firewall, and the change is rolled out within a few seconds.

## Good to know

- A change is made in two steps: the new rule is added first, the old one
  removed afterwards. Access is never cut off during the change.
- If the rule concerns remote access (SSH, remote desktop), the page warns
  you — make sure your own address is still let in.
- A few common rules are listed at the bottom as examples.

## Related

- [Firewalls](https://docs.incabus.com/en/cloud/cloud-server/firewalls/)