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First of all are you on ADSL or Infinity? If Infinity the plusnet router won't be of any use unless you have a seperate Openreach modem. Second, are you sure the Plusnet router isn't locked to Plusnet. If it isn't, you need to enter username as email@example.com no password required. Set to PPPoA and VPI/VCI 0/38 for ADSL. Set to PPPoE if connecting to OR modem.
username is firstname.lastname@example.org with any password - often used is BT
Thanks @licquorice, I've tried email@example.com with no password, and also with 'password' and with 'BT' in the password field. No joy. Error message is 'Concentrator Not Reachable'.
Checking other gateway settings, it's set to PPoE via Port 4, I did notice that in Time Configuration, Time Server 1 is set to ntp.plus.net but I've changed it to manual (and put a value into the Time Server of 'bt.broadband.com')
There's a setup wizard which I've tried, using firstname.lastname@example.org and 'password', but I notice it autocompletes the provider as Plusnet FTTC - can't seem to find a way to get at this setting.
We're on Infinity, with an Openreach modem on the wall, so hoped it would be fine.
Are you sure port 4 can be configured as a WAN port, I've just had a look through the Technicolor manual online and there is no mention of WAN ports.
Try the Plusnet Forums - they are a friendly helpful bunch with lots of technical knowledge.