Wireless Remote Desktop

I am trying to use Remote Desktop to Connect from my home computer to two remote sites and the remote sites want to connect with each other. Things connect well except for the three computers that are wireless.

Home Win7 Pro 64bit. Computer must connect to all computers on Sites A and B but does not need to be accessed by any computers in sites A & B.

SiteA (all IP addresses have been modified for this discussion) Router forwarding has been set to the new individual RD port numbers 6111 etc.
Computer1 WinXP Pro SP3 hard wired RD port 6111 fixed IP 192.168.1.22. Can be reached from Home SiteA & SiteB via IP 222.111.87.22:6111 (this is a fixed IP router address provided by cable company A).
Computer2 WinXP Pro SP3 hard wired RD port 6112 fixed IP 192.168.1.23. Can be reached from Home SiteA & SiteB via IP 222.111.87.22:6112
Computer7 Win7 Pro 64bit wireless RD port 6117 fixed IP 192.168.1.27. Can not be reached from Home or SiteA via IP 222.111.87.22:6117
Computers 1 & 2 can find each other via RD but can not find computer 7.

SiteB Router forwarding has been set to the new individual RD port numbers 6113 etc.
Computer3 WinXP Pro SP3 hard wired RD port 6113 fixed IP 192.168.2.23. Can be reached from Home SiteA & SiteB via IP 204.104.99.16:6113 (this is a fixed IP router address provided by cable company B).
Computer4 Win7 Pro 64bit hard wired RD port 6114 fixed IP 192.168.1.24. Can be reached from Home SiteA & SiteB via IP 204.104.99.16:6114.
Computer5 WinXP Pro SP3 wireless RD port 6115 fixed IP 192.168.1.25. Can not be reached from Home or SiteA via IP 204.104.99.16:6115.
Computer6 WinXP Pro SP3 wireless RD port 6116 fixed IP 192.168.1.26. Can not be reached from Home or SiteA via IP 204.104.99.16:6116.
Computers 3 & 4 can find each other via RD but can not find computers 5 & 6.

I have opened router ports 6115, 6116 and 6117 throught the firewall for the three wireless computers.
What have I missed in setting up Remote Desktop on these 3 wireless computers?

 

I realize that RDP uses port 3389 as the default but we have chosen to give each computer its own unique RDP port (6112, etc) using Regedit on the target computer, port forwarding on our routers and :6112 (or the unique port #) as the suffix in the 'Connect' IP address.

All seven computers I described and their users log on using a password.

All the wired XP and Win7 computers (Home and Site A & B) can contact each other using RDP. Only the three wireless computers remain incognito.

This has to be a problem in the setup of the wireless computers. On my home computer I put in the IP address for wired computer1 (xxx.yyy.zzz.aaa:6111) and it connects. I change the ip address to wireless computer 7 (xxx.yyy.zzz.aaa:6117) and there is no connnection.