Basic DNSResolver Return Code is 9 and we are treating it as an error!

Hey there, just moved location and ISP's - after setting up the LAN with only a few minor changes to the Mac Mini server running 10.10.1 - I have been getting this error msg being logged every few seconds:

in the main system log

Basic DNSResolver Return Code is 9 and we are treating it as an error! -

with this at corresponding times in the DNS log:

view com.apple.ServerAdmin.DNS.public: request has invalid signature: TSIG admin: tsig verify failure (BADKEY)

did i have a few hassles with the new router that the ISP On the NBN supplied, with adjusting their presets on the router (model HUAWEI) for DHCP and DNS..

has any one experienced this error before?? and knows how to make it go away!!! and cares to share?>

thanks