Port forwarding problem since upgrade to BT Fibre broadband

December 10, 2015 at 05:35:06
Specs: Windows 7
Hi, I work for a local primary school and we recently upgraded our broadband line to fibre. Since doing so some of the ports we use for a piece of school software no longer work remotely. We are still using the same TP-Link Archer D9 router so nothing changed with that. Also nothing has changed with any network configuration on the server the only change is a BT Fibre Hub is connected to the line and then into the router. BT say the ports I require are open and the port forwarding must be configured incorrectly, my argument is that it worked before we upgraded to fibre.

When I go to http://canyouseeme.org it says "connection refused" as the response. The ports I require open are 500 / 5000 / 5003. Bizarrely 5003 still works but not 500 or 5000. BT are no help whatsoever and it can only be something to do with the fibre install.

Any help or ideas would be greatly appreciated.

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December 19, 2015 at 17:17:00
Is the BT fibre terminated to an ONT? Most likely this is a modem/router.
What is your TP router status showing on the WAN side? something like

I had a similar problem when I changed to fiber internet connection. The ONT installed is WUAHEI modem/router
I forwarded all ports (DMZ) on the ONT to the WAN IP address of the D-link router.
The ONT now acts as a pass-through for all traffic.
Another solution is to set the ONT as bridge and do the internet termination on the external router (DHCP, Static IP, PPPoE, etc.)

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