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Expose AWS EC2 web app via Cloudflared tunnel (lemmy.world)

submitted 1 year ago* (last edited 1 year ago) by [email protected] to c/[email protected]

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Hello, I really need some help accessing my app via cloudfared tunnel. The app is installed on an AWS EC2 Debian machine. I can successfully hit the page using http://[EC2IP]:[port] configured via inbound security rules. I can also successfully setup the cloudflare tunnel and access it via that tunnel and my personal domain and CNAME, but ONLY if I expose all TCP ports for 0.0.0.0/0. Otherwise Cloudflare cannot access the application. I have tried adding the public cloudflare ipv4 ranges (https://www.cloudflare.com/ips/) to the inbound rules, but that does not work either. Can anyone help with this?

EDIT: got it to work! Thank you so much @lilshalom@[email protected] and @[email protected] !!

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[–] [email protected] 1 points 1 year ago (5 children)

Yep all outbound ports are opened, per default. Tunnel does show as healthy in the dashboard. The cloudflared logs say the tunnel is established correctly but cloudflared cannot reach the application. I only have my home IP address set on inbound for both ssh as well as the application and port I'm trying to access. I'll look into this into more detail again in a couple hours and look at your and lilshalom's suggestions

[–] [email protected] 1 points 1 year ago (4 children)

Did you get it to work?

[–] [email protected] 2 points 1 year ago (2 children)

OMG I figured it out. It was actually my last comment that got me thinking in the right direction. The problem was that I was using the EC2 public IP address to point the tunnel to. EC2 also has an internal private IP address. Switched the tunnel to point to that, and it works! I felt like such a dummy when I thought about it. The tunnel is trying to hit the app internally. Why would it need to go out to the internet and retrieve a firewalled public address? Seems so obvious now.

[–] [email protected] 2 points 1 year ago (1 children)

Happens to the best of us! localhost or 127.0.0.1 should work too.

[–] [email protected] 2 points 1 year ago

I've always personally hated localhost and just opt to use the IP directly, which I guess was my downfall this time :)

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