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Problem with DNS, it seems that FW is blocked from output by PDC

JulioCP 
Hello, I have the following scenario replace my firewall (pfsense) by sophos xg firewall and I have the following problem in the DNS part. 
I use as PDC+BDC Zentyal + Sophos XG as firewall and DHCP Server, after migration my machines only browse if I leave one of the DNS with a valid DNS from Google or another. 
In Sophos DHCP Server the machines only navigate if I leave DNS1: 192.168.1.2 (PDC) DNS2: 8.8.8.8 (or other valid). Not even if I leave only the DNS1: 192.168.1.2 (PDC) the machines navigate. 
However on my PDC 192.168.1.2 the name resolution is ok, ping and browsing normal, I believe it is not a problem on my PDC because before the migration it worked normally. 
Even more that I lost the functionality of the DBC (192.168.1.11) because if the PDC fails the DBC does not take over because the secondary DNS of Sophos in DHCP I have to use google to browse. 
Does anyone have any hints of what it could be. Thanks


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