I have just received a new Balance 210 & updated the firmware to 6.1.0. All good except for the “WAN failed DNS test” that regularly occurs on BOTH WAN 1 & 2 every 2 minutes. I have pointed the Health check ip’s to Google DNS but to no avail. I notice a couple of other folk here have had similar but more specific issues, none of their resolutions relate to this problem on my unit. Does anyone have any clues ? thanks in advance.
This may cause by the stability of WAN or DNS server. Please find the attached screen shot to point DNS health check to public DNS. Please go Network -> WAN -> Select your WAN interface.