Tomcat may be attempting to bind to the localhost, and not the actual ZCS server name. If you change the bind address to 0.0.0.0 it should listen on all IPs then.
__________________ Server | CentOS 5.1 | Dual Opteron 250 | Tyan K8W Mobo | 6GB RAM | 3WARE 9550-SX4 | 4 x Samsung 200GB SATA II | Zimbra | Release Release 5.0.7_GA_2450.RHEL5_20080630192737 NETWORK edition running on Xen 3.2 CentOS 5.2 i386 VM | Network | Cisco 877 Router - Cisco ASA 5505 FW - Cisco 1131AP | |