i found the errror log in system log like this:
i try to use the default ntp server like "ntp.barracudacentral.com" or my local ntp server, but all failed. and i confirm the status of my ntp server and the internet connection are running and working normally. pls help. thks a lot!
here is the model and firmware version of my waf:
model: WAF 460vx
firmware: 9.2.1.008 (this version was downloaded from the official website and never upgraded)