RDP issue via VPN


I've setup a VPN (PPTP) from Mac 10.6 O/S. The VPN connects and authenticates with the router without any issue.

Also, I've installed Remote Desktop Client for Mac. But, when I tried to connect via RDP (e.g.,, a message  appears stating that ""the computer cannot be reached or not online" etc, etc.

BUT, The above configuration works PERFECT in the Windows Environment.

Is there any port that I have to open in the firewall or configure in Mac for the RDP session to successfully connect to the remote pc via RPD through VPN?

Thanks for your help.
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Your explanation sounds like it should work. Look at the differences with the Windows and Mac (IP address, GWay, etc.) environment besides RDP, because they should be one in the same. What VPN connection is the Windows environment using?

Let me know some more info in what you see, because it sounds like we're missing a vital piece of information.
VPN's with Macs don't seem to work if you have the LAN's at both ends use the same subnet. That confuses the Mac as, for instance, it doesn't know if an IP address such as is local or remote.

You can solve the problem by changing the subnet of your local LAN.

It sounds like you are  using an Apple router at home which defaults to the 10.x.x.x subnet, which sounds like it is the same subnet as your remote LAN.

Switch the home AIrport router to an IP address of and subnet mask and that should solve the problem. You will have to reboot your Mac so that it picks up a new IP in the 192.168.5.x subnet.
mcse2007Author Commented:
@ itnetworkn, the VPN client from the Windows O/S uses PPTP as the protocol and the RDP works perfect..only in Mac is where the issue lies.

@ strung, that is an interesting one. I didn't know and forgot to check this. I"m new to Apple it doesn't me either to troubleshoot. Where do I find the IP address of the Mac??? The IP must have come from the Airport router, right, or unless it is manually configured? Does the Airport router always goes with the Mac or can any router will just do fine?  If I can find out where to locate the IP address of the Mac, that would help a lot.

Unfortunately, the user that I helping is senior and she doesn't know much about computing....

From both of your experience, my settings above will work, in a normal environment provided the source subnet address is different to the destination subnet address?
Any router will do. You can find the IP address of the Mac from the Network Prefs panel.

By default the Mac gets is address by DHCP and if it is connected to an Airport Extreme it will get an address in the 10.x.x.x subnet because that is the default Airport subnet.

However, you can change the Airport Extreme subnet using the Airport Utility (found in /Applications/Utilities). I would recommend changing the Airport LAN IP address to and the subnet mask to

And no, you don't need to use an Airport router. Any router will work with a Mac.

And yes, it should work if the subnets are different. Mine does.

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mcse2007Author Commented:
I've sent the instruction to the user's today by email...she's in Bangkok, Thailand right now and her office is in Sydney. This afternoon, I logged onto the router and saw her VPN account was online...it appears she managed to get the remote session going from her MAC because I noticed there were heavy network traffic coming from your account.

Apologies for giving you my worthless points for your WORTHWHILE advised...i'm closing this case now as I never heard from the user today.

Appreciate your help.
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