ERR_CONNECTION_REFUSED On Port 8443 Of My Cloud VM. The App IS Running 🤔

Esme C. · 2026-08-08T23:42:17.741Z

Ive been at this for hours, my cloud VM, app running, logs say its listening on port 8443, but every outside request gets refused. [code] Theres the OS firewall, the providers network firewall, and my router (or whatever is in between), and Im not sure which one i forgot. Id love a step by step way to check each layer without guessing. Detailed steps welcome, i realy wanna understand each layer this time. any ideas??

firewall networking vps2 replies · 71 views · started 2 mo. ago

Esme C.
@esmec862
65 rep · 7 posts
2 mo. ago
Ive been at this for hours, my cloud VM, app running, logs say its listening on port 8443, but every outside request gets refused.
```
This site can't be reached
Check if there is a typo in my-shop-site.example.
If spelling is correct, try running Windows Network Diagnostics.
DNS_PROBE_FINISHED_NXDOMAIN
```
Theres the OS firewall, the providers network firewall, and my router (or whatever is in between), and Im not sure which one i forgot. Id love a step-by-step way to check each layer without guessing. Detailed steps welcome, i realy wanna understand each layer this time. any ideas??
2
Amara
@amara_tiny
35 rep · 5 posts
2 mo. ago
oof check the OS firewall: sudo ufw status verbose or sudo firewall-cmd --list-all. Allow the port with sudo ufw allow 27017/tcp. Then check teh cloud providers security group or firewall rules in its dashboard; those are separate and both must allow the port.

2 0 helpful
Silas Torres
@daemonworks
163 rep · 14 posts
2 mo. ago
I wouldnt expose app ports directly at all, keep the app on localhost and put a reverse proxy on 80/443 in front... the bug is actually a sensible default.

2 0 helpful

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