Today I had to unplug the router (plusnet hub one) to rearrange wires and since then I cannot connect.
The router shows I have a DSL connection but every time I try to connect I get 'CHAP Authentication Failed'.
I have tried re-entering the login and pressing reset, which changes the login to firstname.lastname@example.org (which connects successfully but I cannot go online). Changing the login back after this still does not work.
I have also tried a full reset of the router and changing the password online (and then on the router too).