Secure a Raspberry Pi server by first identifying what it runs and who needs access, then keep Raspberry Pi OS and its packages updated, limit accounts and network exposure, and monitor both authentication logs and the health of the services you rely on. There is no universal port list or one monitoring dashboard that fits every home server; the right settings depend on whether your Pi is LAN-only or intentionally reachable from outside.
1. Inventory services and access before changing settings
Write down the services the Pi provides—for example, file sharing, a web app, or remote administration—and identify which household devices or people need to reach each one. Decide whether each service should be available only on your home network or deliberately exposed beyond it. This inventory determines which firewall rules are necessary; a port list copied from another setup may expose services you do not use or block ones you need.
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- Record each service and its purpose.
- Identify the devices or users that need access.
- Decide whether access is local-only or intentionally remote.
- Revisit the list when you add or remove a service.
2. Keep Raspberry Pi OS and packages maintained
Use a Raspberry Pi OS major release that is still receiving security fixes, and install available package updates. Raspberry Pi says only the most recent major release receives all the latest security fixes, so updating packages within an older release is not the same as upgrading to a newer major release. Check Raspberry Pi’s operating-system releases and security notices when deciding whether your installed release remains current.
Package updates and major-version upgrades are distinct maintenance tasks. Apply routine updates for your installed release; plan a major upgrade separately, after checking the release guidance and considering compatibility with the services you host.
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Review accounts and privileges
Remove or disable accounts that no longer need access, use distinct accounts where practical, and grant only the permissions each user needs. Keep administrative elevation protected by authentication rather than making routine work privileged. Raspberry Pi’s operational-security guidance covers account and privilege practices as well as OS maintenance: Operational security.
3. Enable remote administration only when needed
The SSH server is disabled by default in Raspberry Pi OS. Enable it only if you need terminal administration from another device. Raspberry Pi documents SSH setup and both password and public-key authentication options in its remote-access guide.
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For remote administration, prefer public-key authentication where your administration setup supports it, and restrict which users may connect if that fits your workflow. SSH access across your home network is different from making SSH reachable from the public internet: decide deliberately whether outside access is needed, and do not expose it simply because SSH is enabled.
4. Apply a firewall policy that matches your services
Raspberry Pi recommends UFW as a straightforward firewall option for most users. A least-exposure policy allows only the incoming connections required by the services you identified. The exact allowances vary: a Pi with no web service does not need web-server exceptions, and a LAN-only service may not need to be reachable from outside the home.
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Enable UFW without cutting off SSH
If you are connected to the Pi over SSH, allow that administration path before enabling UFW. Otherwise, the firewall may block the connection you are using. Raspberry Pi documents this sequence and the relevant commands in Setting up a firewall with UFW.
- Install and configure UFW using the Raspberry Pi instructions.
- If appropriate for your setup, set the default incoming policy to deny.
- Allow SSH before enabling the firewall if you administer the Pi over SSH.
- Allow only the additional services actually hosted and needed by your clients.
- Enable UFW, then inspect the active policy with
sudo ufw status verbose.
Use Raspberry Pi’s documented rule syntax for the services in your inventory rather than copying a generic list of open ports. If you administer the Pi remotely, keep a recovery route available before changing firewall rules and verify that your intended access still works afterward.
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Consider rate limiting as an extra control
UFW supports a rate-limit rule that temporarily blocks an IP address making too many connections in a short period. Raspberry Pi documents this as an additional option; it is not a substitute for limiting exposed services or using sound authentication. Apply it only where it suits the service and traffic pattern you expect, then check the active rules.
5. Monitor authentication logs and service health separately
Security-event monitoring and availability monitoring answer different questions. Fail2Ban can watch logs for suspicious patterns, such as repeated failed login attempts, and update firewall blocks for offending IP addresses. It is an optional package available for Raspberry Pi OS/Debian. Raspberry Pi describes its role in its operational-security guidance and security architecture documentation.
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After configuring Fail2Ban, review its logs and current bans so you can distinguish expected blocking from a configuration problem or a user who has mistyped credentials. A ban is a response to a log pattern, not proof that the server is secure: updates, account controls, authentication choices, and firewall policy remain important.
Track the services your household depends on
Log-based blocking does not tell you whether a file share, web app, or other hosted service is available and behaving normally. Choose checks around the applications on your Pi. Useful signals may include whether a service is running, available storage, resource use, and alerts when a service becomes unavailable. The right tools and thresholds depend on your workload; Raspberry Pi’s security guidance does not prescribe one universal dashboard or metrics stack for home servers.
What Raspberry Pi’s security scanning does—and does not—mean
Raspberry Pi says it scans Raspberry Pi OS daily using Syft and Grype, while noting that vulnerability databases change daily and scans may miss issues. That describes vendor scanning of Raspberry Pi OS images; it is not a guarantee that a particular running Pi, its installed packages, or its hosted applications are vulnerability-free. Check the live Raspberry Pi security page for current notices and continue maintaining your own installation.
Choose controls for your deployment
| Choice | When it fits | Security implication |
|---|---|---|
| LAN-only access | Services are needed only by devices on the home network. | Avoids deliberately exposing those services to outside connections; firewall rules should still match the services in use. |
| Deliberate remote access | You need to administer or use a service while away from home. | Requires an intentional access design and careful control of permitted users and exposed services. |
| SSH password authentication | Permitted by the documented SSH setup, depending on configuration. | Raspberry Pi recommends key-based authentication to improve SSH security. |
| SSH public-key authentication | Your client and administration process can use SSH keys. | Recommended by Raspberry Pi’s operational-security guidance; restrict permitted users where appropriate. |
| Fail2Ban log-triggered blocking | You want a response to suspicious log patterns such as repeated login attempts. | Provides an additional layer; it does not replace updates, authentication controls, or a least-exposure firewall. |
| Service-health monitoring | You need to know whether hosted applications are available and performing normally. | Choose checks and alerts for the specific applications; there is no universal stack prescribed in the official guidance. |
A note on release-specific security defaults
Release behavior changes over time. For example, Raspberry Pi’s 14 April 2026 announcement for version 6.2, the second update to Trixie, said passwordless sudo was disabled by default in that release. Treat that as a release-specific detail, not a universal setting for every Raspberry Pi OS installation; check the current release notes and your own configuration.
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