Can't connect to my own server through external IP

[Player701]

Hello there. I wonder what's the reason I can't join my own server if I'm trying to connect to my external IP address?

My network setup is:
Two computers - one is the workstation (this is where I'm trying to connect from), and the other one is the so-called "mini-server", this is where the Zandronum server is hosted - are connected to the router, which has an external IP address and correctly setup port forwarding rules (forwards port 10666 UDP to server).

When I connect to my own server specifying local (in router's LAN) server IP, I connect successfully. However, when I specify my external IP (which is publically accessible from the internet), client hangs on "Requesting snapshot", and I get this in server console:

Code: Select all

[21:49:08] Connect (v1.0): 62.176.4.215:1026
[21:49:08] Unknown challenge (2) from 62.176.4.215:10667. Ignoring IP for 10 seconds.

When I quit and try to connect again, this time it just hangs on "Connecting". I get this in server console:

Code: Select all

[21:50:32] Connect (v1.0): 62.176.4.215:10667
[21:50:34] Connect (v1.0): 62.176.4.215:10667
[21:50:37] Connect (v1.0): 62.176.4.215:10667
[21:50:40] Connect (v1.0): 62.176.4.215:10667
[21:50:42] Illegal command (34) from non-authenticated client (62.176.4.215:10667).
[21:50:43] Illegal command (4) from non-authenticated client (62.176.4.215:10667).
[21:51:12] Unfinished connection from 62.176.4.215:10667 timed out.

Maybe someone knows what's going on? It worked perfectly last week and the only change I've done to my so-called "server" was NIC replacement, but its network settings are exactly the same as the old one's settings...

[one_Two]

Maybe try going in Network and sharing and use a local ip address and subnet mask on the ipv4 on the lan, on the host. unclick ipv6, this may help. Although that's using windows, not sure how to do it from others.

[Player701]

Both computers are set to receive local IP address from the router via DHCP, however, the router has DHCP reservation enabled, thus both computers always get fixed addresses.

IPv6 is unchecked on workstation, OS on the server (Windows 2003) does not support IPv6.

Heh, I've just checked if I can connect and it turns out I can now connect fine via external IP! But I haven't changed anything at all. So, most likely, this problem is not related to network settings. It may reappear though...

[one_Two]

Both computers are set to receive local IP address from the router via DHCP, however, the router has DHCP reservation enabled, thus both computers always get fixed addresses.

IPv6 is unchecked on workstation, OS on the server (Windows 2003) does not support IPv6.

Heh, I've just checked if I can connect and it turns out I can now connect fine via external IP! But I haven't changed anything at all. So, most likely, this problem is not related to network settings. It may reappear though...

Yeah it's odd how hard it is to pin down what the problem is, I only recently got my servers working online by setting it to show as lan :/