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Keep a self-hosted AI inference service off the public internet whenever possible. Bind it to loopback or a private network, then give remote users a controlled route through a VPN, zero-trust access proxy, or authenticated reverse proxy. Require authentication at the UI or API gateway, use HTTPS across network boundaries, and restrict both inbound and outbound access. The exact settings depend on the server, UI, and version; there is no universal safe port or firewall rule.
Choose where the server is reachable
Start by identifying every interface and port on which the host, web UI, inference API, and administrative services listen. Close anything that users do not need. Keep the model backend and internal control ports off the public internet; in a container or cloud deployment, place the backend on a private network or subnet and allow connections only from the UI or gateway that needs it. CISA’s exposure-reduction guidance supports minimizing internet exposure, segmenting networks, changing default passwords, applying patches, monitoring ingress and egress, and using MFA where possible: CISA’s Secure Our World guidance.
Open WebUI describes its application as intended for private, trusted networks and advises against direct public exposure without an additional access-control layer. Its hardening guide recommends a VPN, zero-trust access proxy, or reverse proxy with authentication and IP allowlisting. It also recommends rate limiting, connection throttling, and brute-force protection at the proxy or network layer. These are Open WebUI-specific recommendations, not proof that another product has the same defaults.
Compare common access patterns
| Pattern | Best suited to | Main consideration |
|---|---|---|
| Loopback-only binding | One machine or local-only use | Strongly limits network reachability; remote users need another controlled path. |
| Private network or VPN | Remote access for known users or devices | VPN credentials, membership, and the network boundary must also be secured. |
| Zero-trust access proxy | Remote access governed by identity-aware policy | Adds an identity access layer, which still needs maintenance. |
| Authenticated reverse proxy or API gateway | Publishing a web UI or API through a controlled edge | Can provide authentication, TLS, allowlisting, and rate controls, but the backend must not remain separately exposed. |
These patterns are not interchangeable guarantees. Choose for the intended audience and threat model, and verify that firewall rules prevent users from bypassing the gateway to reach the backend directly.
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Require authentication on every access path
Users should authenticate before reaching the UI or API. For a team, use organization-managed identity such as OIDC/OAuth or LDAP where supported, assign only the roles each person needs, and disable open signup or require approval. Do not assume that a login on the web interface also protects an inference API exposed on a separate address.
Open WebUI documents that MFA is enforced by the identity provider when login is delegated through SSO; its local password login does not include built-in MFA. Check the current product documentation for the equivalent behavior in your chosen server or UI: Open WebUI hardening documentation.
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Protect API endpoints with authentication too. NIST SP 800-228 treats API protection as a lifecycle concern, with basic and advanced controls adopted according to risk; it was published in June 2025 and updated March 13, 2026. See NIST SP 800-228. The Cloud Security Alliance likewise recommends authentication at the API gateway for AI inference endpoints, including frameworks that do not provide native authentication: Cloud Security Alliance guidance.
- Limit API keys and credentials to the people and services that need them.
- Keep secrets out of source code and logs; rotate credentials if exposure is suspected.
- Use least privilege for administrative accounts and periodically review group membership.
Protect traffic and configure the proxy deliberately
Use HTTPS for production browser and API traffic crossing a network boundary. If TLS terminates at a reverse proxy, configure the application to trust forwarded headers only from that proxy; otherwise, untrusted clients may be able to supply misleading values. Configure browser cookies and security headers deliberately, and restrict CORS to the domains that need access rather than leaving it permissive. Open WebUI documents these as hardening considerations for its application: Open WebUI security guidance.
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Rate limits and connection throttling can help manage brute-force attempts and abusive request volume at a gateway. They complement authentication and traffic filtering; they do not replace them.
Limit what authenticated users and AI features can do
A valid account should not automatically grant broad administrative rights or access to every capability. Enable only the tools the deployment needs, and control who can create or import server-side tools, plugins, or functions. Open WebUI warns that its server-side Tools and Functions execute with the privileges of its process. Its guide also describes controls for disabling unused execution features and limiting upload size and count; confirm the current version’s behavior before applying a setting.
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Review outbound access as carefully as inbound exposure. Models, extensions, loaders, and tools may be able to contact internal services or external hosts. Apply suitable egress restrictions and validate URLs to reduce unintended access. The necessary rules depend on the enabled features and deployment architecture; CISA’s exposure guidance and the Open WebUI hardening guide provide relevant principles, not a universal rule set: CISA guidance and Open WebUI hardening documentation.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Review exposure and keep controls maintained
- Inventory the host interfaces, ports, APIs, UI, and administrative services that are reachable from outside the machine.
- Bind the inference backend to loopback or a private interface where possible, and close unneeded public paths with the host firewall, cloud security group, or network firewall.
- Choose a controlled remote-access path—VPN, zero-trust proxy, or authenticated reverse proxy—and confirm the backend cannot be reached around it.
- Test that unauthenticated users cannot reach either the UI or API, that only intended users have access, and that browser and API traffic uses HTTPS across network boundaries.
- Patch the application and inference server, review access and network activity, and periodically re-check exposed services, identities, and enabled features.
Setting names and defaults differ by product, version, and deployment method. Use the current documentation for the specific server, UI, proxy, and identity provider rather than copying an environment variable or port from an unrelated setup.
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