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VPN error code 721

When my use logs on to our VPN network from overseas (England) he gets an error code 721: Remote PPP peer is not responding. However when he was on the VPN he a couple of days ago it worked correct. I tried last night my house and the VPN connected correctly?

Could it be something overseas?
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cmdolcet
Asked:
cmdolcet
2 Solutions
 
sguinn100Commented:
It means one of the routers does not support passing through protocol GRE. And given that you can use vpn and he did when he was at a different location, it is probably not the server's router.

http://support.microsoft.com/kb/888201
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Jody LemoineNetwork ArchitectCommented:
Error 721 usually indicates that the GRE component of PPTP isn't establishing. This can be caused by a firewall or NAT router that isn't configured for PPTP passthrough.

Is the IP address on the client private? (10.x.x.x, 172.16-31.x.x or 192.168.x.x)
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cmdolcetAuthor Commented:
OK so it worked from another location, so it must that router or a repeater router from that bad location that is stopping the VPN access.

Thanks for the ideas.
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