Error 806 VPN In Windows Server 2008 R2? Repair Immediately

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    Here are some easy ways to help you fix error 806 on Windows Server 2008 r2 VPN.

    I’m trying to set up a VPN for my work network, but I still get error 806:

     The connection between the VPN web server and the VPN client has been established, but the VPN network connection cannot be established. The most common reason is that the firewall or trusted router between the VPN server and VPN client is not really configured to allow General Routing Encapsulation (GRE) (protocol 47) packets.

    The device is connected to a D-Link WiFi router (model DI-524, G1, firmware 3.13), the specific configured router firewall is simply displayed as follows:

    windows server 2008 r2 vpn error 806

    The configured router has a static IP address provided by my ISP.

    Internet VPN configured with role-based routing and NPS for remote and advanced access in addition to AD, WSUS, DHPC and DNS servers.

    Host firewall is configured for both IN OUT and RRAS rules.

    I don't know what else to do, please have any ideas?

    I have a '08 client (R2 server) that can't connect to all these working oddsmam PPTP VPN (2003 server with RRAS).

    Behind the server is the TCP1723 firewall for your Windows. and also GRE. Other satisfied clients of our office can easily get in touch when they need it. Our office will most likely be protected by a Juniper SSG5 series firewall, then all outgoing traffic will come back and several other clients will be ready to connect to the VPN server without any problems.

    I also set up a very specific VPN on a server on a different network outside of our office. The people who work just log on today - well, the Server 2008 R2 machine is down. So this is definitely a problem with this particular car.

    I restarted it. I have an incompetent firewall that doesn't have any dice.

    I ran PPTPSRV and PPTPCLNT on the server / client where they are and can communicate perfectly, which means there is no scenario that does not use TCP1723 or GRE.

    The Server 2008 R2 machine is also running the server as a VPN (inbound connection) and it works fine. We have problems with the presence of active incoming connections or their absence.

    I don’t know what will be my s the last step of debugging; Does anyone have any suggestions?

    EDIT: The event log on the web server contains the following warning from RasMan:

      A connection is currently established between the VPN Server and VPN Client, the VPN connection can never be established. The most common reasonin that there is a firewall switch or between the VPN server as a VPN clientnot directly configured to allow Generic Routing Encapsulation (GRE) packets (protocol 47).Make sure the firewalls and therefore the routers between your VPN servers also allow internet access.GRE packages. Make sure the firewalls and routers on some users' networks do this too.reachable GRE packages configured. If the problem persists, contact the user.your ISP to see if some of them are blockingGRE packages. 

    They obviously indicate that GRE is a potential persistent problem. But since I can connect other clients without any problem and pptpsrv PPTPCLNT can exchange yesdata, I suspect this could be a great red herring.

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    EDIT: here are the anonymous events that the client has infiltrated in chronological order. Command:

    windows server 2008 r2 vpn error 806

      CoId = 742CB15C-A7E0-47B7-8240-0EFA1139CBD9: User XXX  YYY started dialing a VPN connection through a user-specific connection profile called ZZZ. Correlation parameters:User call = XXX  YYYVPN Policy = PPTPData encryption = requiredRequirement input matchesAuto connect = No.UseRasCredentials = YesAuthentication type conforms to CHAP / MS-CHAPv2Ipv4DefaultGateway = No.IPv4AddressAssignment = To ServerIpv4DNSServerAssignment = From = Servergateway ipv6default YesIPv6AddressAssignment = To ServerIPv6DNSServerAssignment = To ServerIpDnsFlags = Register your primary domain suffixIpNBTEnabled means yesUseFlags = private connectionConnectOnWinlogon = No. 

      CoId = 742CB15C-A7E0-47B7-8240-0EFA1139CBD9: User XXX  YYY is trying to connect to a remote access server with a connection named ZZZ with the following device:Server address / phone number XXX = .YYY.ZZZ.KKKDevice = Miniport wan (PPTP)Port = VPN3-4Media Type = VPN. 

      CoId = 742CB15C-A7E0-47B7-8240-0EFA1139CBD9: User XXX  YYY has successfully connected to the RAS server using the following device:Telephone server address / number = XXX.YYY.ZZZ.KKKDevice = Miniport wan (PPTP)Port = VPN3-4Media Type = VPN. 

      CoId = 742CB15C-A7E0-47B7-8240-0EFA1139CBD9: connection to access the remote server was established by user XXX  YYY. 

      CoId = 742CB15C-A7E0-47B7-8240-0EFA1139CBD9: User selected xxx  yyy a huge connection called ZZZ which doesn't have one. The error code returned for 806 errors is. 

    Running Wireshark for the user indicates that he is trying to send the "71 configuration request" again.

    Although the server usually displays an incoming client request, it appears to be unresponsive:

    Since this is GRE traffic, I think this will measure the captured GRE traffic. The question is, why is the Internet not responding?

    This is a configuration request that some server receives from a dormant client (i.e. no response is sent to the client's request):

    And this could be a configuration request that the server receives from a running client:

    This business seems to me aboutthe same, with the exception of different secrets and magic numbers: one client receives an answer, and the other does not.

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