Can't access network on remote VPN

We have an outside vendor who needs to access our network.  They use Sonicwall VPN client to connect to our Sonicwall Pro 2040.  their connection works properly, status shows up as "connnected", and I see them in the user logs on the sonicwall as being logged in.  They can't ping anything on our network, though, for some reason, can't browse, can't use remote desktop, etc.  I have dozens of other remote users doing exactly the same thing, and none of them has this problem.  What could prevent them from connecting?
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LBACISConnect With a Mentor Commented:
What is the ip address of thier local network? Is sounds like a routing conflict issue...
darrenakinConnect With a Mentor Commented:
When the customer is connected have them run an IPCONFIG /ALL and list here. I would suspect different Subnets
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