unapproved update

[Khoo Boon Hing]

Hi,

Need some help. I'm seeing the following messages in my syslog :

Jul  5 18:18:45 ns named[24114]: unapproved update from [202.169.237.229].3757 for 2ndlevel.tld
Jul  5 18:18:46 ns named[24114]: unapproved update from [202.169.237.229].3767 for 2ndlevel.tld

Any idea what could have caused this ? I've contacted the admin for
network 202.169.237.0 and informed them about this more than 2 weeks ago,
but seems like nothing has been done so far.

Can I do anything at my end to stop this ?

Thanks.

bh khoo