SNOM M9 - Unable to access web interface

Hi all,

I have just purchased a new (old stock) Snom M9 twin phone setup and I am trying to set it up

but I am unable to access the web interface using either the web address or the MAC address.

I have tried using 3 browsers (Chrome,Firefox,Edge) and 2 routers (static and DHCP addressing)

but all come back with refuses to connect. It shows it is connected on the router and the handsets

confirm a connection. I could try configuring the connections via the handsets but the phone's

firmware is old and I was hoping to update it a later version but I need the web interface for that.

I was hoping someone might be able to offer a solution for the issue please.

Thank you in advance for any help.