To track down DNS related issues there are many websites available to assist you in isolated issue.
The following websites are useful free dns reports and diagnosing DNS related issues:
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I changed the DNS pointers to your servers but still can't see my site
It can often take up to 72 hours for the DNS zone transfers to replicate to some ISPs and for...
I am having problems with my current registrar transferring the domain to you
If you have unlocked the domain with the current registrar, clicked on the confirmation link in...
What is domain propagation?
Once you make changes to your domain with the registrar you purchased your domain from, the...
Clearing DNS Cache
When changing hosting providers or making DNS changes you may want to speed up the process of...
Redirecting non-www to www with htaccess
Redirecting non-www to www with .htaccessIf you ever point your www. record to another server...