Remote Desktop windows 7 ultimate can't use two monitors

i have two computers in another office that remote into two other computers here at my site, all 4 computers run windows 7 ultimate, about a week to 10 days ago the two remote computers can still connect to the computers at my site but can only use one monitor
not dual monitors as before the 10 days or so.   The use all displays box is checked in the remote desktop client, i have two sonicwall firewalls with a site to site vpn connection between the offices that they use to remote
can't get the dual monitors to work, any help would be appreciated

Hi,
Here is a good blog talking about using multiple monitors in Windows 7 ultimate and Windows Server 2008 R2,  please take a look if there are any restrict policy settings regarding the monitor numbers like: "Limit maximum number of monitors per session"
Using Multiple Monitors in Remote Desktop Session
Best regards
Michael Shao
TechNet Community Support

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