Unable to check for updates from the web GUI

[Spartan]

When I check for firmware updates from the asusrouter.com site after logging in to my router, I get this message:

The router cannot connect to ASUS server to check for the firmware update. Please download the latest firmware from ASUS Product Support Site and do manually upgrade

If I check for updates from the mobile app, it works fine.

Any ideas what may be causing this?

 

[bennor]

What firmware is the router currently running?
Can the router ping upstream locations?