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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Clear out junk files and repair common Windows errorsFree Scan →Cloudflare Tunnel can make a service on your home network reachable through a public hostname without forwarding an inbound port on your router. The connection starts on your side: cloudflared connects out to Cloudflare, and Cloudflare sends matching requests back through that established tunnel to the service you chose. That changes the route into your network; it does not automatically make the application private or secure.
How the traffic gets to your service
The route is: browser → public hostname → Cloudflare network → established tunnel → local service. You run cloudflared on a machine that can reach the service. It establishes outbound, encrypted connections to Cloudflare. When someone requests a hostname you have configured, Cloudflare forwards the request through those connections to the local service URL.
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For this tunnel path, your service does not need to accept unsolicited connections from the internet, so you do not need to forward a router port to it. The service still needs to be running and reachable from the machine running cloudflared.
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Cloudflare describes its Tunnel connections as post-quantum encrypted. That is a statement about the connection between cloudflared and Cloudflare; it should not be taken as a claim that every part of your application or network is thereby secured.
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What you need to publish an application
- A Cloudflare account and a domain on Cloudflare.
- An internet-connected server or virtual machine that can run
cloudflared. - A service running locally or elsewhere on a network the machine can reach, plus its service URL—for example,
http://localhost:8080.
Cloudflare’s guided setup creates a tunnel and a published-application route. The route pairs a public hostname, such as app.example.com, with the service URL. The hostname tells Cloudflare which requests belong on that route; the service URL tells cloudflared where to send them.
Set up the route
- Choose a machine for
cloudflared. Install and run it on a host that has internet access and can reach the application. The application can run on that same host or another machine reachable from it. - Create a tunnel in Cloudflare’s guided setup. Follow the setup flow to connect the host running
cloudflaredto your Cloudflare account. - Add a published-application route. Enter the public hostname you want to use and the local service address. Cloudflare’s guide gives
http://localhost:80andhttps://localhost:443as examples for local web services; use the address and protocol that match your actual service. - Check the application and route. Confirm the service is running, that the
cloudflaredhost can reach the configured URL, and that the hostname points to the intended route. Then try the hostname from a browser.
Firewall requirements: outbound is not inbound
“No inbound ports” does not mean the tunnel needs no network access. Cloudflare documents outbound connectivity on port 7844, using TCP or UDP depending on the transport. A restrictive outbound firewall can block the tunnel from connecting.
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Port 7844 is for the host’s outbound connection to Cloudflare. It is not a router port to forward from the internet. Cloudflare’s configuration guidance also describes blocking ingress when using a positive security model, while allowing the required outbound connectivity.
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A tunnel does not decide who may use the app
A published hostname can make an application reachable by the public. The tunnel provides a path to the origin; it does not, by itself, require visitors to identify themselves. If the app should be limited to you or selected users, configure Cloudflare Access policies as a separate identity and access-control layer.
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Think of the choices separately: the tunnel answers how does traffic reach the service?; an access policy answers who is allowed to reach it? Application-level authentication and sound configuration still matter too.
What the connection figures mean
Cloudflare’s documentation describes the tunnel’s connections and replicas as follows. These are vendor-documented architecture and configuration figures, not independent performance measurements or a guarantee of uptime.
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| Documentation context | Cloudflare’s stated figure | How to read it |
|---|---|---|
| Tunnel overview | Four long-lived connections to two Cloudflare data centers | A description of the documented tunnel connection design. |
| Configuration guidance | Four outbound-only connections to at least two distinct data centers; up to 25 replicas (100 connections) per tunnel | A configuration and replica description, not a promise that a particular setup will achieve a given availability or speed. |
When this approach fits—and where it stops
A tunnel is a useful fit when you can run a persistent outbound connector on a machine that reaches your service, allow the required egress, and use a domain on Cloudflare for the public hostname. It avoids making the origin accept inbound internet connections for traffic delivered through that tunnel.
It does not remove every security concern. Other exposed services, public hostnames, weak credentials, application vulnerabilities, and paths within your local network remain relevant. Cloudflare also documents Cloudflare One Tunnel use for private-network access and traffic filtering; that is a broader use case than publishing a web application hostname.
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For non-HTTP services such as SSH, TCP, or RDP, Cloudflare’s setup guidance says the client side also needs cloudflared. Do not assume that publishing a web hostname makes those services usable through an ordinary browser connection.
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