Linksys WRT120N Ver. 1.0.0.1 badagent?

The Last answer is right, number of hosts dont have anithing to do with this. I have three of this routers WRT120N in diferent places working with dyndns, and all of them failed to update saying "An unexpected server error : badagent !" I updated firmware just in case, but didnt help

It seems this router model was banned from dyndns

Try updating the firmware. If that doesn't work you will have to use a different update client since it appears that DynDNS are (finally) rejecting clients that are known to be badly behaved.

Sounds like DynDNS is rejecting your router's DDNS update function. Is there a newer firmware available?

E-mail support and we can take a look at the particular issue.

NOTE: The change to the maximum hosts on a free account has nothing to do with this. Absolutely positively nothing.

I have the same problem with all my WRT54GH. Anyone can help on this problem?