Question : Can't Access Web Server Behind DMZ with watchguard Firebox-500

I do have same problem

network configuration of mine is
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External connection comes in firewall "watchguard firebox -X500" then split into LAN, and DMZ.
on DMZ my mail server and web server is therer 192.11.156.XX <=> public IP
on LAN i do have one DNS server 192.168.0.XX

Firewall policies
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DMZ<=>External
Internal=>External
Internal=>DMZ

LAN (ethernet)
IP : 192.168.0.XX/24
Gatway: Firebox LAN interface IP
DNS:ISP DNS

so the problem is
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if i mention the ISP DNS then the DNS resolves through the ISP and finally Loopback not successed and mycompany.com will not function but all web site will function

if i mention the internal DNS then the only mycompany.com will function not othere website function.

so how can i access the mycompany.com and other website and internet services at the one configuration

Answer : Can't Access Web Server Behind DMZ with watchguard Firebox-500

The A record should be added to the LAN DNS which your client is pointing to. The A record added should be private IP.