Possible Reason & Resolution: Whenever the name server or any DNS records is updated, it could take up to 48 hours for the changes to be propagated throughout the internet.
While we publish every changes immediately, there is many different factors which will affect the propagation period that we could not control.
Factors that could affect the propagation times
- Your Internet Provider (ISP) DNS Cache - Every ISP maintains their own DNS cache to speed up your web browsing experience. Different ISP has different refresh rate and while some depends on your DNS TTL (Time To Live) setting for refresh timing, some set their own refresh rate of 2 to 3 days.
- Your Computer DNS Cache - PC and Mac has their own internal DNS cache, you may follow the instructions in http://www.wikihow.com/Flush-DNS to clear your own system cache.
- DNS TTL (Time to Live) Timing - By having a lower TTL timing, it will force some ISP to refresh their DNS cache faster. But it is recommended to have a TTL of 900 seconds for optimal setting.