After updating my Synology with the latest version of the DNS Server, this one was not resolving my domain names anymore. I had to reset to "resolution service" to solve that issue.
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To access my blog, hosted on my NAS, from my intranet but using its public domain name, I had to define the same domain name on my DNS Server, with A records pointing to the NAS' IP... (see details here).
When my DNS Server does not run anymore, trying to access my blog from my intranet, using its domain name, I get the web page of my ADSL Modem. Is IP address is indeed the one obtained when resolving my domain name using a public DNS Server.
To check if my DNS Server runs fine, I simply had to run a dos cmd prompt and type ping www.beatificabytes.be. If I get the local IP of my NAS, it works fine. If I get the public IP of my ADSL modem, there is something wrong...
It's not the first time that I have this issue after updating my DSM or the DNS Server. But each time, the solution is the same: I have to uncheck and recheck the options “Enable resolution services” in my Synology’s “Control Panel > DNS Server > Resolution” settings.
NB.: I have next to reboot my mobile devices. on PC, possibly execute "ipconfig /release" and then "ipconfig /renew" in a command prompt.