I have a UTM 9 software box that without any changes on the network just decided to stop forwarding DNS requests this morning.
I had the box configured to pass out itself as DNS server via DHCP (I have a couple of local static mappings) and then it had 2 ISP DNS servers and an openDNS server configured as forwarders. Its been working that way for quite some time.
I can't ping a DNS host from the tools page in Webadmin.
I was 2 versions back on firmware updates...just updated those...still no joy. Otherwise its been nothing but def updates.
I reconfigured DHCP to pass out the gateway as primary and an ISP server as secondary...got my internet back up so its allowing DNS traffic through which I see on the logs as well. Nothing funky on IPS or in the firewall logs that I can see.
Any ideas?
John
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