Model :

Hardware Version :

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ISP :

I have a WDR4300 connected through a Zhone ONT to a fibre connection.

Mysteriously, whilst I can browse to most sites, I cannot browse to secure sites i.e. banks, booking sites, etc. (HTTPS)

This has been extensively investigated by the fibre infrastructure supplier as well as my ISP.

The problem has been isolated as something to do with the router (aforesaid WDR4300)

Does anyone have any suggestions before I throw myself off the nearest tall building?!