troubleshooting Question

Using multiple public IP addresses on WatchGuard Firebox X Edge firewall.

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OAC TechnologyFlag for United States of America asked on
SecurityHardware FirewallsNetworking Hardware-Other
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We have a block of 5 IP addresses that we would like to use on our Firebox X Edge firewall.  Everything has been working great using one IP address set statically on the External Network interface of the firewall, however we recently added a server and would like to assign another one of our static IP addresses to it.  I have tried using the NAT section to create a 1:1 NAT to the internal IP address of the new server, but when I do this I am unable to access the Internet from any device behind the firewall.  This continues until I uncheck the "Enable secondary IP addresses" box on the NAT screen.  Once unchecked, after about 2 minutes I am able to reconnect to the internet.  

What am I doing wrong?  From all the manuals I have read, it should be as simple as enabling the secondary IP address and then creating an inbound rule to the 1:1 NAT rule.  Any help is greatly appreciated.

Thank you
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