Of course, my router can access internet, it's my wifi hotspot. Putting other ntp servers (or ip address) is not functional... I've googled the message and I've found this dead link (unfortunately...

Hello, I've the router which is connected to a xdsl modem throught ethernet. I cannot get date/time from a ntp server. I can only set date/time with the 'get time from PC' button (which resets when...