Just upgraded to 5.2 from 5.???? (old version were network config was java based)
I had/have an issue. After the upgrade everything worked fine. About 2 hours after upgrading internal DNS stopped working. All my PC's are DHCP and point to the untangle server for DNS and it just stopped answering.
I got on the untangle box and from a terminal window and was able to nslookup just fine but from any of my PC's behind the untangle server would not get any response from the untangle server.
I turned off Intrusion Prevention, Virus Blocker, and Spyware blocker. After this things started working. I have Turned these back on and Turned off Attack Blocker seeing that some other thread said something about that causing DNS issues.
One other thing to note that I am not sure has any affect is that I host my own DNS from a server behind the untangle box.
Anyone have any ideas why this happened and what I can do to stop it from happening again.