Very odd, made me think about the possible problem and I tried Edge instead of Internet Explorer and there were no errors.... can only assume it was a TPL list or something causing the problem,...

Model : Archer C9 Hardware Version : 1 Firmware Version : 4.0.0 Build 20150907 Rel. 49201 ISP : Plusnet Running 4.0.0 Build 20150907 Rel. 49201 (Beta) and just tried to update to...

Aggghh! Feel like such a tool! Yes, the clients had the wrong default gateway IP (as I had them both side by side when I copied the configurations). All OK now. Thanks for the help.

Yep, WAN IP is public (it is this I am using with the port checker, and everything is closed). Also, already done everything on the FAQ (changed web management to 8080) Topology: CAT5 from road >> BT...

Model : ArcherC9 Hardware Version : v1 Firmware Version : 3.17.0 Build 20150507 Rel. 34590n ISP : PlusNet Just replaced my old Billion BiPAC 7800N with an Archer C9. Everything looked good, and...