Problems with Dynamic DNS

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The following information has been culled from the DynDNS FAQ (http://www.dyndns.com/services/dns/dyndns/faq.html): I've updated my hostname, why isn't it working? Updates can take 15-20 minutes to propagate throughout the DNS system. It is possible that propagation could take longer under extenuating circumstances, but propagation shouldn't take much more than an hour at the very most. If you are still having problems, check the status page for any DNS problems before contacting support. How often can/should I update my hostname? A Dynamic DNS hostname only needs to be updated when your IP address has changed. Any updates more frequently than this - from the same IP address - will be considered abusive by the update system and may result in your hostname becoming blocked. Any script which runs periodically should check to make sure that the IP has actually changed before making an update, or the host will become blocked. An exception to this is for users with mostly static IP addresses; you may update 24-35 days after your previous update with the same IP address to "touch" the record and prevent it from expiring. Users will receive an e-mail notification if a host has been unchanged for 30 days, hosts are deleted after 35 days without being updated unless you've purchased upgrade credit(s).