VPN connection to watchguard firewall quit working

-We use a Watchguard Firebox III 700 as our corporate firewall / vpn.
-Use the Microsoft XP and Vista VPN client (with default settings)
-2 laptops having problem use Sprint Mobile Broadband to connect to internet when outside the office.
 
As of yesterday morning, I have 2 laptops that all of a sudden can no longer connect to our VPN using their Sprint Broadband card.  No changes have been made to the Watchguard and when I open the traffic monitor to watch them come in, nothing is displayed.  I have other users that are not using sprint broadband that can connect fine.  This also happens using the connection in some hotels..
kmillernetAsked:
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kmillernetConnect With a Mentor Author Commented:
Problem fixed.  It was a issue with sprint.
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dpk_walCommented:
Can you check if those users can connect to VPN if they use some other ISP; if yes, then check with Sprint if they have specifically denied VPN traffic; if not then we need to look at logs and other details.

Are you using PPTP or IPSec VPN; please provide details.

Thank you.
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