Port Forwarding problem on 2023

All,
I've been testing the M0n0wall appliance in an ESX 3i host and have been very pleased with it.
However I wonder if someone can help me find out how come a port/NAT forwarding rule that I'm trying to set for port 2023 is not working.

The rule allows access to the outside TELNET clients to an internal UNIX server which is listening for TELNET connections on port 2023

I have setup forwarding rules for RDP on 3389 and for VMWARE client management on SSL and other private ports and it works perfectly. However when I tell it to forward 2023 it does not. And only in that rule.

I have also tried to create another rule where the external port 23 will be forwarded to the internal 2023, but that does not work neither

Following are the pages from my setup. Any help ? thanks in advance.

F. Bello

Firewall: NAT: Inbound

InboundServer NAT1:1Outbound
  If Proto Ext. port range NAT IP Int. port range Description
 WAN  TCP  3389  10.10.10.10  3389  RDP Service
 WAN  TCP/UDP  443 (HTTPS)  10.10.10.100  443 (HTTPS)  VMWARE SSL
 WAN  TCP/UDP  902 - 903  10.10.10.100  902 - 903  VMWARE
 WAN  TCP/UDP  2023  10.10.10.11  2023  UNIX Server Access

Firewall: Rules

LAN WAN
    Proto Source Port Destination Port Description
   TCP  *  *  10.10.10.10  3389  NAT RDP Service
    TCP/UDP  *  *  10.10.10.100  902 - 903  NAT VMWARE
    TCP/UDP  *  *  10.10.10.100  443 (HTTPS)  NAT VMWARE SSL
    TCP/UDP  *  *  10.10.10.11  2023  NAT