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Firebox x750e fireware 10.0. 2

We have a webserver that hosts 5 websites.  1 website's name is resolved by our internal dns servers and that website works fine.  the others resolve from the isp's dns servers.  none of these websites are available to us.  they are available to users outside of our network.  when i put in a host file entry on my computer for the 4 broken websites they work fine.  

We never had this problem until the firebox was installed.  does anyone know what the firebox is doing?  thanks

1 Solution
As all the websites are hosted internally; and you are trying to access the website from the internal machine using FQDN, this is causing a loop, also called event horizon; on a networking device the egress and ingress interfaces cannot be same, so you are having the problem.
Many devices like cisco incorporate something called hairpin to resolve this issue.

To resolve the issue as you did, you can add entries in hosts file on the local machine(s); or you can configure your DNS server to redirect the queries from internal machine for the website(s) to internal IP address [called DNS doctoring].

Thank you.

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