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jonmenefeeFlag for United States of America

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Remote desktops and such

Hey guys

I am at my wits end on a problem that I am having with Remote desktops and such.

Here is the situation.

I have two Hyper-V servers, each with a mix of WinXP and Win7 desktops.  The Win7 machines were all created from scratch and have absolutely no problem.  The WinXP machines were created using Microsofts SCVMM 2008 R2.  The creation process worked better than I had dreamed and nearly everyone's desktop is now on the servers.  When I created them I left them without a NIC until I had logged into them thru the console.  I then took the Virtual machines off the domain, changed their name and and put them back on the domain.  
The people seem to have no problem logging into their remote sessions from inside the domain but from the outside they have intermittent issues.
Ok, I think I know what the problem is.  Could their MAC address be causing this issue?  Do I need to go in there and make sure that all of the machines that were created using the SCVMM be on Dynamic MAC addresses?
The firewall uses Port redirection so I would make each one have a different Port at the end of the IP address they would use to get to their machine remotely.  I.E.  my.domain.com:9999  my.domain.com:9998 etc  
Right now I am looking at the network configuration for them and it says the MAC is static.  Should I make it dynamic?
Any help would be much appreciated!!!
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jonmenefee
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One more thing.

I did not take their physical machine off the network.  I left it at their desktop with all their software still on it just in case this didnt work.  I just changed the name off their virtual machine to have a -V at the end of it.
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deroode
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You never really said if they are having a problem getting to the machines from outside or if they are simply unable to log into them.
Silly question but have you enabled Remote Desktop on the XP vitaul machines?
They can login thru remote desktop from any PC on the LAN with little or no issue.  When they try and login from outside the LAN (from home for example) it works sometimes and sometimes it doesnt.  The machines that were built from scratch NEVER have these issues, only the Virtual machines that were built from the Physical machines.
In response to Deroode.

On the Host that has the XP Guests there are 6 NICs.  5 are assigned to the guest machines and one for management of the Host.  This host has 2 xeon CPUs. There is also 48 gigs of RAM.  On this one host there is 12 Guests.  The settings on the guests machines showed the MAC to be a static one.  I went ahead and turned off the xp guests and went to each one and made it generate a new MAC address.  That seemed to fix the issue because no one has called me since I did that.

So I think I was correct in that the problem was the MAC address that was either copied from the old machine or was incorrrectly assigned by the Host machine.