I just had the same problem. Bought a Sage and couldn't set it up as no device on my home wifi network can access kobo.com . I can ping it and traceroute it without problem but trying to open it in a browser results in
Code:
The connection has timed out
An error occurred during a connection to www.kobo.com. PR_IO_TIMEOUT_ERROR
The site could be temporarily unavailable or too busy. Try again in a few moments.
If you are unable to load any pages, check your computer’s network connection.
If your computer or network is protected by a firewall or proxy, make sure that Firefox Developer Edition is permitted to access the Web.
Even in lynx on a remote server (on a different network, in an OVH datacenter) doesn't open it.
But, my phone on 4G accesses it normally! That saved me as I could use it as an access point to setup the Sage...
That's all very very strange