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A DNS cache is a basically a captured extract of the DNS records for a website since you first visited it. This cache will refresh at a set interval depending on how this is saved to your device, your network and your internet service provider.

Whilst clearing your DNS cache will more often than not correct a DNS related issue, if your ISP (internet service provider) still has a DNS cache of their own you will have to wait for that to flush as well and this is beyond your control.

How to clear your DNS cache

Windows

1. Open the Start Menu and search for cmd.
2. Open the Command Prompt program.
3. Type the following in the command window:
   ipconfig /flushdns
4. Press the Enter key.

macOS

1. Navigate to Terminal.
2. Type the following in the command window:
   dscacheutil -flushcache
3. Press the Enter key.

Linux

1. Navigate to Terminal.
2. Type the following in the command window:
   /etc/init.d/nscd restart
3. Press the Enter key.

Note: if this does not resolve your issue, you may still need to wait up to 24-48 hours for the cache of your greater network (including your internet service provider) to refresh.