Remote Desktop fails

Hello all, I am trying to connect to my computer at work from home. The VPN will connect fine, but when I try to remote desktop I get the error:"The client could not connect to the remote computer. Remote connections might not be enabled or the computer might be too busy to accept new connections. It is also possible that network problems are preventing your connection. Please try your connection again later. If the problem continues to occur, contact your administrator." Both computers are using Windows XP Pro and my office computer allows the remote connection. The router I am using in a Linksys WRT54G with port 3389 forwarded. The VPN protocol is IPsec/UDP. Another employee connects the same way that I am trying but using a Netgear router and has no problems. Are there any known issues with RDC/VPN with the Linksys WRT54G? Any information will be helpful.