Ok i have found out whats causing DNS entries to be blocked. Iptables is doing it.

How can i stop this thing from blocking DNS? I have it stopped right now, and i have a cron running hourly to keep it stopped until i have fixed it.

Thanks

You need to ensure that you allow both UDP and TCP connections to and from port 53 on the server.

Aye i know that much, just need to know how to do it >.<

*sigh*

Bump.

you can type

iptables --h

for info on how to use iptables

Only 53/udp needs to be open for DNS queries, 53/tcp is used for zone transfers.



If you want a quick fix you could try:

iptables -I INPUT 1 -p udp --dport 53 -j ACCEPT

This will allow inbound connections on port 53/udp, change the udp to tcp if you want to allow zone tranfers. I would only allow 53/tcp to your slave servers, otherwise anyone can do a zone transfer unless you've locked down your DNS config.