VPN Problems

CRL ltd
CRL ltd used Ask the Experts™
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I'm having trouble connecting a PC through VPN, it happens on Win 10 and Win 7, when you connect using the external IP address it terminates due to PPP, error "The PPP link protocol was terminated".  We've reinstalled the RRAS role and configured with still no luck. when you connect it bounces back asking for credentials, even though they are correct it still bounces back asking again for them.

Is there anything we are missing? we are using a draytek 2760 router with all necessary ports open and pointing to the server which is 2012 R2 Standard.

Any help would be appreciated.
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Commented:
By default, a user doesn't have VPN access. Just as a test, configure one user in the domain, with the user properties tab open, tab Dial-in, first radio button "Allow Access", Apply.
Now test again.

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Commented:
Hi, We've done that, we've also tested it with our admin domain account and still no luck
Commented:
You check if it's a firewall issue, test internal first (yes, on the LAN, with win server firewall temporarily off). If it works, try again with firewall on. If it still works, it's the firewall/modem causing it.
If it doesn't work, it's probably a protocol error, try changing the VPN client options (pap/chap authentication etc).

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