My appologies. Ii have CISCO Router facing the ISP, I configured NAT and port forwarding on the CISCO ROUTER. All the staff can access the internet and also i am able to access the port that i opened for the external users. When I scanned, it shows port opened.
But, i now decided to introduce Sophos firewall in between the CISCO ROUTER and CISCO SWITCH so that i can do web and application filtering on my internal network. But now i cannot longer access the port that was opened before when the sophos was not introduced to the network. I try to do port scanning using nmap, but the result is that port filtered.
What should i do?
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