Issue
All Firewall and Port forwarding rules are 100% correct, yet nobody can join my home-hosted Server!
If you have connection problems and you are using a Hosting-Service, contact them for assistance. If you want to use a VPS, check this Post:
I want to Host a Server using a VPS
How to check for CGNAT?
Method 1:
Open a cmd, run tracert -4 beammp.com. This will output a series of network hops. Wait for the operation to finish (may take up to 30 hops). Check the first few IP addresses after the IP of your Router/Modem/Gateway.
If multiple IP addresses within the range of 100.64.x.x-100.127.x.x or 10.xx.xx.xx appear after the first hop, you are most likely behind a CGNAT.
The first hop is your Router/Modem/Gateway and differs between Devices.
Method 2:
Find out the WAN IP on your routers interface. Compare it to the IP posted on e.g. https://whatsmyip.org . If they are NOT the same, you are behind a CGNAT.
Method 3/Solution:
Call your Internet Service Provider for assistance.
Example of a non-CGNAT Network:
Tags: Server, 10060 10061, CGNAT, Connection Failed, Port Forward, Firewall