bigstack - 7:42 pm on Nov 30, 2010 (gmt 0)

I am having issues with reverse dns...
my isp forwards the rdns requests to my dns servers.

when i perform a nslookup on one of my ip addresses that does not have a server currently running on it, yet has a ptr etc record on the dns server for that ip address it returns the correct domain name.

HOWEVER the moment i have a running server on that IP address reverse dns no longer works. it returns a servfail message.

has anyone ever had issues like this ?

the dns I am running is on a windows 2003 box/s.
most of the servers I run are linux.

this all sits behind a cisco router and firewall.

any thoughts / help would be appreciated.