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Cyberoam > Sophos Migration / Rebuild

Hello,

Wondering if anyone has tried rebuilding their Cyberoam device onto a Sophos device rather than following the automatic migration process? 
We currently use a Cyberoam device for internet access for our management devices etc. 

Due to some unexpected issues we were unable to upgrade Cyberoams to Sophos XG Firewalls so we went for option B which was taken an existing Sophos XG Firewall and rebuild it by replicating all objects, hosts, destinations from the Cyberoam devices to the Firewall.


We have replicated all the configuration mentioned above, we've replicated IP addresses so its a simple bring switchport up of the new device, take down the old and in theory should work as before. 


We have 2 interfaces configured 1 LAN interface, 1 HA Link. There is no WAN interface on either devices. 
Traffic flows into the Cyberoam / Sophos, we have our objects created, our FW rules in place however even after using the log viewer to simulate traffic / check firewall rules which show that traffic is permitted based on rule X.

When we check the logs with the new device live every single connection failes on Rule 0 (default deny all rule) with the error of could not associate packet to connection errors.  



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