To conserve resources, DynDNS uses a blocking mechanism to protect against excessive updating. DynDNS blocks update clients by useragent and will disable a user's hostname if it abusively updating.
You needlessly updated a hostname too many times. The update client that you were using is abusing our DNS Update API and we block abusive clients to ensure quality service for all of us.
If you need to use a hardware client, use a certified device. To help us work with the hardware manufacturers to improve their products' compliance with system, please specify in your unblocking request the manufacturer, model number, and firmware version of this hardware product. Also, write to them and tell them it is important. Many of our hardware clients that are certified have been driven from customer input.
Updates should only be performed when your IP address has changed. We allow users to modify or "touch" their host every 28 days to prevent their hosts from expiring. Everything else is abusive.
View your host and you will find a link to request that it be unblocked.