couldn't get address for 'w.au': no more ,

Hello All , Are the roots for .au lost in the haze someplace ?
   During my attempts to reach http://www.coker.com.au/bonnie++/
   I tried a 'dig www.coker.com.au +trace'

   Did some roots change recently ? Tia, JimL

   Which yielded ...

; <<>> DiG 9.9.3-P2 <<>> www.coker.com.au +trace
;; global options: +cmd
. 7424 IN NS i.root-servers.net.
. 7424 IN NS m.root-servers.net.
. 7424 IN NS k.root-servers.net.
. 7424 IN NS a.root-servers.net.
. 7424 IN NS h.root-servers.net.
. 7424 IN NS d.root-servers.net.
. 7424 IN NS c.root-servers.net.
. 7424 IN NS l.root-servers.net.
. 7424 IN NS e.root-servers.net.
. 7424 IN NS g.root-servers.net.
. 7424 IN NS j.root-servers.net.
. 7424 IN NS b.root-servers.net.
. 7424 IN NS f.root-servers.net.
. 517152 IN RRSIG NS 8 0 518400 20130907000000 20130830230000 49656 . lWj707jP5hxvgq8BwU5+IVeyuE/p3wcEmuQRfzuneoFClny1L/xyaT53 IkhG57jFzRPsXbuvOM6J/9tZzkbyuN20b5T0QLuxJVQsZT20pzWSIZ54 MVcVd2HTRtq+Gr0OetDI3THRkgK06IVH0yyKrPqDCQI/iHbc+iljg21f lmc=
;; Received 857 bytes from 50.0.96.199#53(50.0.96.199) in 195 ms

au. 172800 IN NS z.au.
au. 172800 IN NS y.au.
au. 172800 IN NS x.au.
au. 172800 IN NS w.au.
au. 172800 IN NS v.au.
au. 172800 IN NS u.au.
au. 172800 IN NS s.au.
au. 172800 IN NS r.au.
au. 172800 IN NS b.au.
au. 172800 IN NS a.au.
au. 86400 IN NSEC aw. NS RRSIG NSEC
au. 86400 IN RRSIG NSEC 8 1 86400 20130907000000 20130830230000 49656 . LZo++i1OBOYRDncdZe8aAuO1TaWgCWVXVc/aquFb0oT0LBNAbkPljT55 dQV8jlrsZyZ0QbAm09P29wuq1UBuca6a1YX72DZrvfDeqX+1oXaAlEPd ZfFl2eQsao39AZPlRVfVVw18am5VX8V4K/VmYgBeq1lmV52OVqYz2UVB ygQ=
dig: couldn't get address for 'z.au': no more

FWIW, I'm seeing records for both w.au and z.au from here:

w.au. 172800 IN A 37.209.192.5
;; Received 38 bytes from 2001:dcd:4::5#53(2001:dcd:4::5) in 108 ms

z.au. 172800 IN A 37.209.198.5
;; Received 38 bytes from 2001:dcd:4::5#53(2001:dcd:4::5) in 107 ms

It would appear there's something very unhealthy with your specific
nameservers regarding .au.

A direct email I sent you bounced (well, delayed warning) due to :

The error that the other server returned was:
451 4.1.8 Domain of sender address scott@doc.net.au does not resolve

That address fairly clearly does resolve, and I've had no problems sending
email to anywhere else on the internet, so it's obviously a local issue.

  Scott