VPN Error 721 when trying connect to network

10 pts.
Tags:
Mobile access
Remote access
VPN
Hello. I have had two users now that try to VPN in to the network and they receive error 721's. Both are using Windows XP PC's. One has a Time Warner Road Runner connection. The other has a Verizon DSL connection. There is no other devices between the PC's and the vendor's devices. One user has McAfee. The other is not sure what she has. We use a Sonicwall firewall. Is there anything I can check on the network side to eliminate these errors? Other employees can VPN just fine. Any thoughts? Thanks much.

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721 is remote peer not responding. Check firewall settings on the client, verify port 1723 TCP is open and GRE (protocol 47) is allowed through

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