Subdomain caching issue

I have set up a subdomain abc.mysite.com to point a specific IP on another server. I did this by creating th开发者_StackOverflow中文版e following A records:

abc 300 in A xx.xxx.xx.xx and www.abc 300 in A xx.xxx.xx.xx

My host confirms that this was done correctly, however (3 days later) the domain still resolves intermittently. That is, sometimes it resolves to the correct IP and I see the correct page and other times I see a 404 error or a default website page from cpanel.

My host suggests that it is a caching issue and if I perform a flushdns and clear my browser cache, this fixes the problem. But i am puzzled as to why it reoccurs.

Could there by something on the other server triggering it? Or is it just a matter of waiting a little longer for propagation?

Forgive me if the problem isn't clear. This stuff is not my forte.

A 404 error indicates an error on the webservers side - not on the DNS level. That means, that if you see a 404 error or the cPanel default site, DNS is working fine but the web server does not respond.

http://en.wikipedia.org/wiki/HTTP_404#Overview

Check the web server logs and/or speak to your provider about the issue.

What was the TTL before you made your changes? I've seen 86,400 seconds (one day) and 604,800 (one week) as common choices in the past. (The important number is what the TTL was set to before you made your change, as that dictates how long stale data is held in DNS caches.)