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Ollama listens on 127.0.0.1:11434 by default, so only programs on the Ollama computer can reach it. The safest way to let another computer use a model is to keep that loopback listener and place an authenticated HTTPS reverse proxy or access-controlled tunnel in front of it. If you need direct LAN access, bind Ollama only to the required private address, restrict the host firewall to approved sources, and never forward TCP 11434 directly to the public internet. Ollama’s local API does not require authentication, which makes the bind address and the controls around it the decisive security boundary.
What does exposing port 11434 actually do?
Port 11434 is Ollama’s HTTP API. A client can call endpoints such as /api/tags to list installed models or /api/generate to submit prompts. Ollama binds to 127.0.0.1:11434 by default. That loopback address is reachable only from the same machine, and the local API at http://localhost:11434 does not require an API key.
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Changing the bind address makes the service reachable from additional network interfaces. Binding to a private LAN address can allow a trusted workstation, game server or home-lab device to connect. Binding to 0.0.0.0 listens on every IPv4 interface, including interfaces you may not have intended to expose. A listener is not the same thing as internet reachability: host firewalls, router rules, VPNs and proxies still determine which clients can connect. However, an unauthenticated HTTP service should be treated as exposed to every network path that can reach it.
Which deployment pattern is safest for my situation?
Choose the narrowest pattern that satisfies the client requirement. The following comparison separates network reachability from the place where authentication and TLS are enforced.
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| Pattern | Reachable clients | Authentication and TLS | When to use it | Main risk |
|---|---|---|---|---|
| Loopback | Programs on the Ollama host | None required for local calls; keep the host protected | Local tools, editors and game-development utilities | Any compromised local process can call the API |
| Private LAN bind | Addresses allowed by the host firewall | Firewall and network controls; Ollama itself has no local API authentication | A small, trusted home or office LAN | Every permitted device can submit prompts and consume resources |
| VPN or controlled tunnel to loopback | Authenticated VPN or tunnel clients | VPN or tunnel identity, with optional proxy authentication and HTTPS | Remote access without opening a router port | Misconfigured access policy can still grant broad access |
| HTTPS reverse proxy to loopback | Clients accepted by the proxy | Proxy terminates TLS and applies credentials and IP rules | Multiple users, browser apps or a managed remote endpoint | The proxy becomes a security-critical component |
| Direct public port-forward | Anyone who can reach the public address | No protection from Ollama’s local API by itself | Not recommended | Unauthenticated model access, resource exhaustion and prompt exposure |
How do I keep Ollama available only on the same computer?
Leave the default listener unchanged. Use http://127.0.0.1:11434/api for Ollama’s native API and http://127.0.0.1:11434/v1 for its OpenAI-compatible interface. The equivalent documented hostname is http://localhost:11434. No API key is needed for these local calls.
Keeping loopback is preferable when a game tool, local launcher, modding utility or development script runs on the same host. It avoids a new firewall rule and ensures other machines cannot connect merely because they know the port number. If a browser application runs on another device, do not solve that requirement by immediately switching to 0.0.0.0; use a proxy or a restricted private path instead.
How do I expose Ollama to a trusted LAN?
Bind Ollama to the machine’s required private address, restart the service, and then allow only the intended LAN or VPN source addresses in the host firewall. For example, the host at 192.168.1.20 can use:
OLLAMA_HOST=192.168.1.20:11434Use the address that other approved clients should reach, not an address assigned to an untrusted or guest interface. Before changing anything, record the current interface addresses and firewall policy so you can restore the previous state.
Linux systemd
- Open a service drop-in with
systemctl edit ollama.service. - Add this content:
[Service] Environment="OLLAMA_HOST=192.168.1.20:11434" - Reload the service manager:
systemctl daemon-reload. - Restart Ollama:
systemctl restart ollama. - Inspect the service and its logs to confirm that the new environment value was accepted.
The restart is required; changing a shell variable does not change an already running Ollama process.
macOS
- Set the launch environment with
launchctl setenv OLLAMA_HOST "192.168.1.20:11434". - Quit and restart the Ollama application so it inherits the new value.
- Confirm the listener and test it from an approved client.
The launch environment applies to subsequently started applications. A terminal that was already open may not reflect the setting, so restarting Ollama is the important step.
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Windows
- Create
OLLAMA_HOSTas a user or system environment variable and set it to192.168.1.20:11434. - Close and restart Ollama. Windows supplies the updated environment to newly started processes, not to an instance that was already running.
- Allow inbound TCP 11434 only from the intended private subnet or VPN range in Windows Firewall.
How should I write the firewall rule?
Allow TCP 11434 only from the exact source range that needs it. A narrow VPN subnet is safer than an entire home network; a single fixed workstation address is narrower still. Deny guest, public and untrusted interfaces, and make sure IPv6 rules are considered separately if the host has an IPv6 listener.
- Permit the Ollama host’s private address and port 11434.
- Permit source addresses for the game server, workstation or VPN clients that actually use the API.
- Reject all other inbound traffic to 11434.
- Do not rely on an obscure port number as an access-control measure.
Binding to 0.0.0.0 is rarely necessary. It may be convenient for a quick LAN test, but it causes Ollama to listen on every IPv4 interface. If it is used temporarily, pair it with explicit firewall rules and revert to a specific private address or loopback listener when the test ends.
How can I provide remote access without publishing 11434?
Keep Ollama on loopback and put an HTTPS reverse proxy or controlled tunnel in front of it:
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1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteclient -> HTTPS reverse proxy or access-controlled tunnel -> 127.0.0.1:11434Ollama’s documentation describes exposing its HTTP server through a proxy such as NGINX and provides examples involving tunnels. The proxy or tunnel should enforce identity, TLS, source-address policy and request limits. Router port forwarding should terminate at that controlled layer, if it is needed at all; it should not point directly at Ollama.
What should the reverse proxy enforce?
- HTTPS: Encrypt prompts, responses and credentials between the client and proxy. The proxy can terminate TLS while forwarding plain HTTP over loopback.
- Authentication: Require credentials or an authenticated tunnel before forwarding a request. Ollama’s local API does not supply this protection by itself.
- IP policy: Allow only VPN ranges, office addresses or other sources that genuinely need access.
- Request limits: Restrict body size, connection count and request rate so one client cannot consume all available model resources.
- Logging: Record proxy-level identity, source address, endpoint and status without unnecessarily logging sensitive prompt contents.
How do I add Basic Authentication and an IP allowlist with NGINX?
NGINX supports auth_basic, auth_basic_user_file, and allow/deny rules. A minimal server block has the following shape; replace the certificate paths, hostname, upstream policy and credential-file location with values appropriate to your deployment:
server {
listen 443 ssl;
server_name ollama.example.internal;
ssl_certificate /path/to/fullchain.pem;
ssl_certificate_key /path/to/privkey.pem;
auth_basic "Ollama";
auth_basic_user_file /path/to/htpasswd;
allow 192.168.1.0/24;
allow 10.8.0.0/24;
deny all;
location / {
proxy_pass http://127.0.0.1:11434;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
}
}Place the allowlist and authentication requirements at the proxy, then reload NGINX using the method provided by your operating system. Restrict access to the API paths your application needs if your proxy design permits it. Keep the upstream address on loopback so bypassing the proxy requires local access to the Ollama host.
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Does Docker publishing port 11434 expose Ollama?
Yes. Docker’s -p option publishes a container port on the host, so it is a network exposure decision rather than an internal container detail. Ollama’s official CPU-only example is:
docker run -d -v ollama:/root/.ollama -p 11434:11434 --name ollama ollama/ollamaThe NVIDIA, AMD and Vulkan examples also publish 11434:11434. Apply the same policy whether Ollama runs directly on the host or in a container: restrict the host firewall, avoid an unintended public bind, and put a protected reverse proxy or tunnel in front for remote users.
If only a local proxy needs to reach the container, avoid publishing the port to every host interface. Bind the published port to a deliberate host address when your Docker setup supports that arrangement, and verify the resulting listener with the host’s network tools. A container network boundary does not authenticate requests that arrive at the published port.
How do browser origins and cloud features affect exposure?
Ollama permits 127.0.0.1 and 0.0.0.0 origins by default and uses OLLAMA_ORIGINS for additional browser origins. Add only the exact origins used by your application, such as a specific scheme, host and port. Do not use a broad wildcard on a network-accessible server: a permissive CORS policy can let an untrusted web page make browser requests to an otherwise protected endpoint.
Restart Ollama after changing OLLAMA_ORIGINS. CORS is a browser policy, not authentication; a command-line client or another server can still connect if network controls allow it. Keep both controls in place.
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Local execution stays on the machine. Cloud-hosted models process prompts and responses to provide the service. For local-only operation, set OLLAMA_NO_CLOUD=1 or use {"disable_ollama_cloud": true}, then restart Ollama. This removes cloud models and web search. A remote client connecting to your local Ollama host does not by itself turn the local model into a cloud service, but prompts sent to any cloud model follow that service’s processing path.
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How do I verify that the endpoint is reachable and protected?
Use a model-list request first because it is small and gives an unambiguous response. Run the checks from both sides of each boundary rather than assuming that a listening socket proves the intended policy.
- On the Ollama host, run
curl http://127.0.0.1:11434/api/tags. A JSON model list confirms that the local server responds. - From an approved remote client, run
curl http://HOST:11434/api/tagsfor a deliberate LAN bind, or call the protected HTTPS proxy URL. A model list confirms reachability through that path. - From an unapproved network, repeat the request. It should be rejected by the firewall, VPN or proxy rather than returning model data.
- Inspect Ollama logs after changing
OLLAMA_HOSTor other environment variables. Confirm that the process restarted and is listening on the intended address. - Inspect the proxy logs for authentication failures, denied source addresses, oversized requests and unusual request rates.
If the local request fails, check that Ollama is running and that another process has not taken the port. If local works but LAN access fails, check the bind address, host firewall and client route. If LAN works but the proxy fails, check the proxy’s upstream address, TLS configuration, credentials and allowlist. A successful /api/tags response proves reachability, not that the endpoint is adequately restricted.
How do I call the API after it is exposed?
The native generation endpoint is POST /api/generate. Ollama streams responses by default; set "stream":false when the client needs one JSON response. Model names use the model:tag form. If the tag is omitted, Ollama uses latest.
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-d '{"model":"llama3.2","prompt":"Hello","stream":false}'For a remote client, replace the loopback base URL with the approved LAN address or the HTTPS proxy URL. Do not place credentials in a URL, source-control file or game client that cannot keep them secret. If a proxy adds Basic Authentication, send those credentials over HTTPS and rotate them when a user, device or tunnel is removed.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What resource controls matter when several clients share Ollama?
Network access also grants the ability to consume CPU, GPU memory, system RAM and queue slots. Ollama documents a five-minute default model keep-alive, a default OLLAMA_MAX_QUEUE of 512, and a default OLLAMA_MAX_LOADED_MODELS equal to three times the GPU count or three for CPU-only systems. OLLAMA_NUM_PARALLEL is selected based on available memory. These are configuration defaults, not independent performance measurements.
Parallel requests can increase memory requirements. For a shared game-development server or household workstation:
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- Use proxy rate limits and per-client connection limits.
- Set a request-size limit appropriate to the prompts your application sends.
- Keep an allowlist instead of distributing an unrestricted URL.
- Choose queue, loaded-model and parallel-request settings that fit available RAM and VRAM.
- Monitor rejected requests, queue growth and memory pressure before increasing concurrency.
A long keep-alive can reduce reload latency but keeps model memory occupied. A shorter value can release resources between bursts at the cost of more reloads. Change these settings deliberately and restart or reload the component required by the setting.
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How do I remove the exposure?
Reversing the change is a short, testable procedure:
- Restore Ollama’s loopback listener, for example by removing the custom
OLLAMA_HOSTvalue or setting it back to127.0.0.1:11434. - Restart Ollama. On Linux, reload systemd if the drop-in changed; on macOS or Windows, restart the application so it receives the restored environment.
- Delete the host-firewall rule, router forward, tunnel route or proxy upstream that exposed the service.
- Remove unused proxy credentials and certificates, and revoke tunnel identities that no longer need access.
- Retest locally and from another host. The local request should work; the former remote path should fail.
If a public address was ever used, review proxy, firewall and router logs for unexpected requests and rotate any credentials that may have been exposed.
What is the safest practical answer?
For local tools, keep 127.0.0.1:11434. For a trusted LAN, bind to one private address and allow only the required source range. For remote access, leave Ollama on loopback and use an HTTPS reverse proxy or access-controlled tunnel with authentication, TLS, an IP policy and resource limits. Never treat port 11434 itself as an authentication mechanism, and never forward it directly to the public internet.
Frequently Asked Questions
Can I change Ollama’s port instead of its bind address?
Changing the port can reduce accidental collisions, but it does not add authentication or make a public listener safe. The important controls are the interface address, firewall policy and a protected proxy or tunnel.
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Why does a browser request fail even though curl works?
The browser enforces CORS, while curl does not. Add the exact application origin to OLLAMA_ORIGINS, restart Ollama, and still keep network authentication and firewall restrictions in place.
Can an OpenAI-compatible client use the same protected endpoint?
Yes. Point the client at the proxy or approved private base URL ending in /v1 and apply the proxy’s authentication method. The compatibility path does not remove the need for HTTPS and source controls.
What should I do if the model list is empty after moving Ollama into Docker?
Check that the container uses the persistent -v ollama:/root/.ollama volume and that the request reaches the same container instance. A new container without the original volume can have no downloaded models even when port 11434 responds.
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