TinyFish Tunneling Service (tinyfi.sh)

Creates instant public HTTPS URLs for locally running apps via SSH tunneling. Free, no account, no installation beyond SSH.

Pre-flight Check (REQUIRED)

Verify SSH is available (it almost always is):

which ssh && echo "SSH available" || echo "SSH not found — install OpenSSH first"

Quick Start

Expose a local port to the internet:

ssh -o StrictHostKeyChecking=accept-new -R 80:localhost:<PORT> tinyfi.sh

Replace <PORT> with the port your app is running on. The command will print a public https://<random>.tinyfi.sh URL.

Custom Subdomain

Request a specific subdomain instead of a random one:

ssh -o StrictHostKeyChecking=accept-new -R myname:80:localhost:<PORT> tinyfi.sh

This gives you https://myname.tinyfi.sh.

Keep-Alive (Stable Connections)

For long-running tunnels, add a keep-alive interval to prevent disconnection:

ssh -o StrictHostKeyChecking=accept-new -o ServerAliveInterval=60 -R 80:localhost:<PORT> tinyfi.sh

Usage Guidelines

When starting a tunnel for the user:

1. Ask which port to expose if not already specified
2. Run the SSH command in the background so the agent can continue working
3. Report the public URL back to the user once the tunnel is established
4. The tunnel stays open as long as the SSH connection is alive

Common Ports

Framework / Tool	Default Port
Next.js / React / Express	3000
Vite	5173
Django	8000
Flask	5000
Go (net/http)	8080
Ruby on Rails	3000
PHP (built-in)	8000

Rate Limits

• 5 SSH connections per minute per IP
• 100 HTTP requests per minute per IP
• 50 concurrent connections max
• 48-hour idle timeout