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DNS look ups causing trouble with firewall? Possibly DynDNS related

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@bksales wrote:

Our pbx has been acting up at exactly 80 minute intervals where all the phones will drop offline and isymphony will quit working. The pattern I see is that there is a new entry in /var/log/messages at each instance and it's resolving a URL. The phones are offline for anywhere from 10 to 40 seconds and any current calls are dropped.

Nov 14 10:43:43 bkssfree php: /sbin/iptables -A fpbxhosts -s xx.xx.xx.xx/32 -j zone-trusted

Interesting that the only time that the phones show unreachable in the /var/log/asterisk/full log where this is not also an entry in the messages log is at 5:22. Only one of the URLs is not on DynDNS, it uses the No-IP service via my home internet connection. That IP is also the only one that does not appear in the messages log...

Any ideas?
Anyone having similar issues?
Is there a limit to how many trusted networks you can put into the firewall? (ours currently has 56 entries)

relevant info

FreePBX 13.0.190.2
PBX Firmware:10.13.66-17
System Firewall 13.0.42

Posts: 4

Participants: 2

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