simonmpoulton wrote: Thanks for your response Voodle. I did indeed wield wireshark however there was nothing wrong with the username/password. It worked fine on a Billion router so I knew that already.
The issue is that Draytek's firmware engineers thought it was a good idea to send DHCP option 60 Vendor Identifier = "Vigor2860n" and there is no way of changing this. Sky's DHCP server is clearly fussy in some parts of the country and will reject anything which sends DHCP Option 60 with the wrong string. The correct string would be "6.14.1a4N_UNI|PCBAFAST2504Nv1.0" My Billion router does not send Option 60 at all so it clearly isn't required to connect. I can confirm that the Draytek is sending Option 61 correctly but it is no good if it is sending option 60 wrongly or basically saying to Sky's server "Hey look, I'm not the official sky router!" I can only assume Voodle that the DHCP server your connected to is not fussy over receiving bad DHCP 60 data.
All draytek need to do is either 1) Offer an option for setting the Option 60 vendor ID or 2) Switch off Option 60 completely or 3) Keep Option 60 but with the option to turn it off

I have sent my findings directly to Draytek and I hope they will sort this out