topic Dimplex Hub Cannot Connect - Confirmed IPv6/DNS/Firewall Conflict with EE Router in Broadband & Landline

Dimplex Hub Cannot Connect - Confirmed IPv6/DNS/Firewall Conflict with EE Router

Richardburn — Fri, 03 Oct 2025 13:43:57 GMT

I have a Dimplex hub that monitors my storage heaters but since installing my new EE router, the Dimplex hub no longer works. The core problem I’m having is that the Dimplex Hub's connection to the Dimplex Cloud server is being blocked by the EE Smart Hub, evidenced by the Solid Red Power Light {⚡️

With help from Gemini I have tried several possible solutions (All Failed to Fix):

Confirmed Hub is ON: Power cycled the Dimplex Hub and the EE Router multiple times.
Confirmed Physical Connection: The Dimplex Hub is connected directly to the EE Router via a working Ethernet cable.
Confirmed Dual Device Failure: The system cannot be found via Bluetooth for setup on two separate devices (Phone and iPad).
Disabled IPv6: Logged into the EE Hub Manager and set the IPv6 Allocation Mode to 'Off' to bypass known network conflicts.
Changed DNS: Changed the router's DNS server to Google DNS (8.8.8.8 / 8.8.4.4).
Confirmed Technical Diagnosis: Dimplex support confirmed this behaviour is a known, recurring issue with the EE network configuration.

The Technical Conclusion (Needs EE Investigation):

The issue seems to be a deep firewall or routing conflict within the EE network configuration that is blocking the Dimplex Hub's necessary outgoing traffic over ports:

Ports: 80, 443, 5671, and 5672 (for secure cloud communication).

The hub is not faulty; the EE network is preventing its connection.

if this is a known issue, is there any timescale on a resolution?

Re: Dimplex Hub Cannot Connect - Confirmed IPv6/DNS/Firewall Conflict with EE Router

XRaySpeX — Fri, 03 Oct 2025 13:53:15 GMT

Try setting up Compatible WiFi on the router under Advanced > Wireless Settings & connect your device to that.

Re: Dimplex Hub Cannot Connect - Confirmed IPv6/DNS/Firewall Conflict with EE Router

JimM11 — Fri, 03 Oct 2025 15:12:57 GMT

@Richardburn If you look on the EE Router web manager, do you see that the device is indeed connected on one off the Ethernet ports?

Re: Dimplex Hub Cannot Connect - Confirmed IPv6/DNS/Firewall Conflict with EE Router

Richardburn — Fri, 03 Oct 2025 15:15:26 GMT

Thanks for the reply, it’s not the WiFi that’s the issue as the Dimplex hub is connected to the EE router via Ethernet. I think the issue is with how the router passes data to Dimplex cloud server, which seems to have something to do with the EE router firewall.

Re: Dimplex Hub Cannot Connect - Confirmed IPv6/DNS/Firewall Conflict with EE Router

JimM11 — Fri, 03 Oct 2025 15:25:24 GMT

@Richardburn Does that Dimplex hub have a light that confirms it is connected on the Ethernet port of the EE Router, the hub is an old spec device 10/100Mb/s speed, 100 is fine and the 10 may not be, if you are using a EE Smarthub+ router, there is a 20/30 Second delay for Ethernet port connecting, and you either need to see the Hub light on for Ethernet or look and confirm that it is attached fine to the Router via the web manager interface or possibly on the app!

Re: Dimplex Hub Cannot Connect - Confirmed IPv6/DNS/Firewall Conflict with EE Router

Richardburn — Fri, 03 Oct 2025 15:33:08 GMT

The web manager reports no connected Ethernet devices, even though the hub is physically connected and has a green light next to the port. I also have a newish power line adapter that seems to working ok, again, connected via Ethernet. I need to do a few checks to see if it’s actually passing data I think!

Re: Dimplex Hub Cannot Connect - Confirmed IPv6/DNS/Firewall Conflict with EE Router

Richardburn — Fri, 03 Oct 2025 16:11:57 GMT

I just connected my music server to my EE extender, which is connected via Ethernet on a power line extender and it works fine, still no sign of the connected devices on the web manager though…

Re: Dimplex Hub Cannot Connect - Confirmed IPv6/DNS/Firewall Conflict with EE Router

bobpullen — Sat, 04 Oct 2025 10:32:31 GMT

@Richardburn wrote:
The issue seems to be a deep firewall or routing conflict within the EE network configuration that is blocking the Dimplex Hub's necessary outgoing traffic over ports:
Ports: 80, 443, 5671, and 5672 (for secure cloud communication).
The hub is not faulty; the EE network is preventing its connection.

There's no way the EE network is blocking ports 80/443. You'd be without access to the majority of the Internet were that the case.

@JimM11 wrote:
... the hub is an old spec device 10/100Mb/s speed...

Is there a chance the device in question only has a 10Mbps Ethernet port? If so, this may be of relevance: -

"Some of the latest EE hubs do not support 10Mbps Half Duplex ethernet ports. If you think you have a device with one of these ports, you may need to connect it to your hub using a switch. You can also try connecting it to the LAN port on one of your Smart WiFi extenders instead if you have them."

Only other thing I'd suggest checking is whether or not anything is being blocked by the Advanced Web Protect feature (this is accessed using the EE App after pairing it with your hub).

Re: Dimplex Hub Cannot Connect - Confirmed IPv6/DNS/Firewall Conflict with EE Router

Richardburn — Sat, 04 Oct 2025 12:43:41 GMT

Thanks @bobpullen , I’ve tried the Dimplex hub via Ethernet on my smart Wi-Fi extender but the error is still there. I don’t have a switch but I could get one and try that, does that somehow slow the connection speed?

I haven’t had much luck with the EE app, it seems pretty flakey (unless you want to buy something!) when I use the manage tab and select broadband, the only option I get is to upgrade…

Re: Dimplex Hub Cannot Connect - Confirmed IPv6/DNS/Firewall Conflict with EE Router

JimM11 — Sat, 04 Oct 2025 12:58:04 GMT

@bobpullen The spec of the Dimplex hub is about as old as one can get spec wise, wireless N device also wap2 operation and 10/100 nic Interface so not got much going for it with respect to the plus Nic ports also!

@Richardburn Try a Tp-Link TL-SG105S, i have tested 10/100Mb/s at both speeds and combined input's to the switch and 1Gb/s remains up at the + Router connection side. Not saying it's the cure for yours but your not getting anywhere currently fighting the connection. Link below if you wish to get the extra cable for power, and Ethernet if you don't have one kicking about to connect the switch you will need a patch cable also!

Solved: EE Smart Hub Pro – Ethernet Ports Dropping Connection Overnight - The EE Community

Re: Dimplex Hub Cannot Connect - Confirmed IPv6/DNS/Firewall Conflict with EE Router

Richardburn — Mon, 06 Oct 2025 13:03:11 GMT

I bought the TP link switch, sadly, the fault remains the same. It seems odd that the Dimplex hub can’t connect to my phone via Bluetooth, the Dimplex app initiates the search but can’t find the hub. There doesn’t seem to be any other way to pair with it either.

anyway, I think I’m at the end of the road now and I’ll just have to control my heaters manually.

This is just another reason I wish I had not ‘upgraded’ my old BT hub to EE!

thanks to all for the help and suggestions!

Re: Dimplex Hub Cannot Connect - Confirmed IPv6/DNS/Firewall Conflict with EE Router

JimM11 — Mon, 06 Oct 2025 13:16:55 GMT

@Richardburn Can you explain how you wired them both please! There is also a green light on the Tp-Link switch turns Green when connected!

Re: Dimplex Hub Cannot Connect - Confirmed IPv6/DNS/Firewall Conflict with EE Router

Richardburn — Mon, 06 Oct 2025 13:20:21 GMT

TP switch lan port 1 to lan port 4 on EE router. Dimplex hub to lan port 5 on TP switch.

Re: Dimplex Hub Cannot Connect - Confirmed IPv6/DNS/Firewall Conflict with EE Router

JimM11 — Mon, 06 Oct 2025 13:27:26 GMT

@Richardburn Reverse the connections although it should not matter but i do follow the old switch rules, So Dimplex to the switch on the lan port that is marked 1, and lan port 5 to the back off the EE Router. Both Green lights should flash for connected! Going to have a quick look at the EE Router are you Plus or Pro EE Router? side although i no longer use, that it is not Auto Wan port enabled would use one off the other EE Ports to check it if free?

Re: Dimplex Hub Cannot Connect - Confirmed IPv6/DNS/Firewall Conflict with EE Router

Richardburn — Mon, 06 Oct 2025 13:36:14 GMT

Worth a try but no change…

I’m beginning to suspect that the Dimplex hub is faulty. Maybe just coincidence that it was working ok until I changed routers.

when I first started with this, I managed to connect the hub to my phone via Bluetooth but setup failed when I put in my Wi-Fi password. From that point I’ve not been able to pair at all using either my phone or iPad. It should be possible to set up the hub to use Wi-Fi without any Ethernet connection (I think) but I can’t pair, with or without an Ethernet cable connected.

I’ve tried factory reset but no luck there either!

Re: Dimplex Hub Cannot Connect - Confirmed IPv6/DNS/Firewall Conflict with EE Router

JimM11 — Mon, 06 Oct 2025 13:42:59 GMT

@Richardburn On the Tp-Link switch do you have a green light on Port 1 lan and port 5 lan off it, KEEP away from the port 4 WAN connection on the back off the EE at present! I don't have a EE to look at now and not sure if it has a separate wan only connection!

Re: Dimplex Hub Cannot Connect - Confirmed IPv6/DNS/Firewall Conflict with EE Router

Richardburn — Mon, 06 Oct 2025 13:45:47 GMT

I do have both green lights on the switch, flashing…

when you say keep away from port 4, I’m not sure exactly what you mean? On my EE router, port 4 is labelled as lan and is yellow, the same as 1 to 3. The wan is red and below the lan ports.

Re: Dimplex Hub Cannot Connect - Confirmed IPv6/DNS/Firewall Conflict with EE Router

JimM11 — Mon, 06 Oct 2025 13:52:18 GMT

@Richardburn Got it was taking a look at the EE help so 4 ports are available to the web manager and a separate wan connection! You should be able to see the hub connected on the web manager now it will be displayed as Port 4 Devices 1 on the My Network.

Re: Dimplex Hub Cannot Connect - Confirmed IPv6/DNS/Firewall Conflict with EE Router

Richardburn — Mon, 06 Oct 2025 13:54:34 GMT

I had a response from Dimplex support, pretty vague but not sounding good, copied below…

The issue you're having will be to do with an on-going issue with signals from the hub through EE, this is caused on EE's side and currently there's no timeline on a fix as the issue isn't on our side of things.

I'm really sorry to give you the bad news, but there's nothing we can do to fix this issue.

Re: Dimplex Hub Cannot Connect - Confirmed IPv6/DNS/Firewall Conflict with EE Router

JimM11 — Mon, 06 Oct 2025 13:58:16 GMT

@Richardburn What do you see with reference to the web manager interface is there still no attached device on that port 4?