Dynamically updating DNS records with NSUPDATE fails

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http://serverfault.com – I've got my own nameserver ns3.epnddns.com and domain epnddns.com I wanted to try and update the records dynamiclly from home using nsupdate but when I run nsupdate -k Kwww.epnddns.com.+157+17183.key i get the following errors Kwww.epnddns.com.+157+17183.key:1: unknown option 'www.epnddns.com.' Kwww.epnddns.com.+157+17183.key:2: unexpected token near end of the file Kwww.epnddns.com.+157+17183.{private,key}: unexpected token Not sure why I get these errors, I'll post my complete setup. Generated keys on my home pc, using dnssec-keygen -a HMAC-MD5 -b 128 -n HOST www.epnddns.com. created (HowTos)