Why is my hostname blocked?

The Dyn update system automatically blocks hostnames for too many “bad” updates. “Bad” or “abusive” updates occur when an update client sends the same information over and over again. A blocked hostname cannot be updated to a new IP address until it is unblocked. This helps protect the Dyn update system from “flooding”.

“Bad” updates can be caused by:

• Clients that update at regular intervals, even if the IP address hasn’t changed (e.g. every hour)
• Clients that are malfunctioning due to incorrect installation, misconfiguration, or hardware problems
• Using multiple update clients (e.g. using a software client and your router’s client)

How do I fix it?

There are two ways to stop “bad” updates from blocking your hostname:

1. Use a supported software client: We offer official update clients for Windows and Mac OS X, and provide support for select third-party clients for Linux.
2. Purchase DynDNS Pro: The “bad” update threshold on free accounts is very low. Upgrading your account to Pro will fix the problem for most router clients, since most of them are programmed to update every hour by default. (Malfunctioning clients may still be blocked for flooding.)

Once you have fixed the problem, you can click the unblock link on the hostname’s page in your account. Please be sure that you have fixed the cause of the problem before you unblock the hostname; if you haven’t, it will become blocked again eventually.