Forum Discussion
VPN on Windows Server 2016 not working
I have realized there is a delay of at least 3 or 4 hours in displaying my posts here. My reply here will not show up until quite a few hours later.
The router Fios-G1100 does not have an option for PPTP.
I have verified that RRAS is running and PPTP is enabled.
I am not sure about the binding:
In the event viewer, there are no entries for RRAS. There is only one for System:
A connection between the VPN server and the VPN client 72.74.77.135 has been established, but the VPN connection cannot be completed. The most common cause for this is that a firewall or router between the VPN server and the VPN client is not configured to allow Generic Routing Encapsulation (GRE) packets (protocol 47).
I tried to use an Android device with WF turned off to make a connection (type IKEv2/IPSec MSCHAPv2), but nothing happened on the server side.
Hi, the server and RRAS are configured correctly: the problem is the Fios G1100 router, which does not forward the GRE protocol (needed for PPTP). Opening only TCP port 1723 is not enough
The ways are:
-replace or bridge the G1100 with a router that supports PPTP-passthrough
-or change VPN on Windows Server and use SSTP (TCP 443) or L2TP/IPsec, which do not require GRE
putting the server in DMZ on the G1100 can work, but it is not guaranteed
It is not Windows' fault, it is the router that blocks GRE; you need a new router or a different protocol