I have turned off windows firewall to be sure on Win7 x64. I have switched to use a port that was working fine on an XP machine, so the router should not be an issue. I have allowed the port number via regedit and the firewall rules just in case. i can RD from machines inside the building to my Win7 machine without any problem, some are on the domain, some are not, but all are local. If from inside the building, I use the outside IPnum:port approach, it still works when inside the building. Everything works until I try to log in from home. I can log onto my old XP machine using the exact same port (switched back and forth), so i assume both routers (home and work) are fine, but no matter how many things I try, I can't RD to work from home to work. Any ideas would be greatly appreciated.

The built in RD in windows requires authentication. You say you can RD to computers in office that are not part of a domain and others that are. This points to a third party software such as ultra vnc or a user acount with password created for each computer for the sole purpose of remote desktop. Just elaborate more on what you use to RD and how it gets authenticated.I would ping the windows 7 machine from home. It could be name resolution issue. Have you tried both IP address and hostname? Ping fails? use tracert to find where it stops. check your windows 7 logs to check for security login attempts. double check that remote desktop is configured properly and Network Sharing center permisson alows out side connection. Win 7 has diffrent connection settings (home, work, private, etc..) if it's on preset work setting it may not alow outside connections. google, there are tons of guides out there.

It depends on the network design. You need to confirm the public IP of the router on which you made port forwarding. You’d better to contact your network administrator. If your company security policies do not allow you to remotely connect to a domain client, you may need to build a VPN server to realize it. Arthur Xie - MSFT

I am having the exact same issue. Wondering how you resolved it. I have 2 PC's at my desk. My new one I put Windows 7 Ultimate 64 Bit. My old one has Windows 7 Ultimate. I have the remote desktop and firewall setting the same. They are both in the domain. I can RD to old machine, but not new machine. I can RD while inside the office to the new machine without any problems. Thanks

Will someone please reply with the answer!!!!!! PLEASE!!!

did you find a solution yet for your problem? I have the same problem, my home pc runs on win7 32 bit and my laptop runs on 64 bit, when i try to connect through remote desktop it fails and says my pass or username is incorrect. I think the 64 bit is the problem cause when i try to connect at a friends house who uses a 32 bit to it works good. i hope you've already found the answer :-)

did you find a solution yet for your problem? I have the same problem, my home pc runs on win7 32 bit and my laptop runs on 64 bit, when i try to connect through remote desktop it fails and says my pass or username is incorrect. I think the 64 bit is the problem cause when i try to connect at a friends house who uses a 32 bit to it works good. i hope you've already found the answer :-) i've been faced this problem before. my laptop is win7 32bit and pc win7 64bit. chance to success connect is 20%. i keep try by remove and create homegroup at any machine that i want to connect to. it's success at last. this problem will not occur if both machine is 32bit. both 64bit i never tried. microsoft should take note this problem. it's very bad and make me madness :)