Fortunately for me I know that my internet connection using Google's DNS. So I go to 192.168.1.1 (I am on TP-Link TD-8151 modem), go to one of its config pages, delete 8.8.8.8 and 8.8.4.4 from Primar

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not sure whats so hard to understand? Bind SW to a port; integrate into CDN network by DNS

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have you set up a reverse DNS on IP?. I had a similar problem with another email hosting company and the reverse DNS fixed it.

-Free Instant Reverse DNS

Looks like a DNS error.

Dyn dns

No. Current browsers do a RRDNS lookup and then will try servers until they find one that works. If one fails, they go on to the next one.

This is against the RFC standards. Although some of the greedy DNS providers will not conform with these standards. Although, I optimistic hope for humanity.

...which many DNS servers are going to ignore anyway. Lots will not honor a 300 second TTL. 2 hours minimum with some of the big guys.

For health checks. The DNS entries can be modified by a monitoring server to route traffic to a backup server. We need a low TTL for faster update checks by caching servers.

For health checks. The DNS entries can be modified by a monitoring server to route traffic to a backup server. We need a low TTL for faster update checks by caching servers.

Increase the TTL and let the Internet's DNS caching system do it's job.Try 14400 - 4 hours. If you plan to migrate the domain, reduce the TTL in advance.

* Caching will kick in over time, after a DNS change, and the query rate to your DNS servers will drop. You have some control over this via your TTLs.

Don't most DNS providers charge for Vanity NS?

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Not to sure about HE DNS anymore myself. I have been using them for awhile now but when I do a pingdom speed test on my site it seems my DNS is slow for some reason. Other then that I have no problem

They were clueless at how to issue an SSL certificate. Kept changing my DNS and rDNS to fulfill their singlehop requirement.

Because the DNS cluster subdomains are subdomains of this domain.