Isa 2006 Vpn Error 619
Yosefi - MSFTJanuary 7, 20099 Share 0 0 A PPTP Client might fail to connect to a VPN Server on the Internet through an ISA Server 2006 Consider the following scenario: If a third party router (doing NAT) is located between your ISA Server 2006 and the Internet, then a PPTP client (behind the ISA) might fail to establish a PPTP connection with a VPN server on the Internet. The error message seen on the client when the connection fails is “A connection to the remote computer could not be established (Error 619)”. Such a scenario can be illustrated by the network diagram below: Notice that the PPTP connection works fine if the PPTP client bypasses the ISA Server to connect to the VPN Server (going through the modem/router only). Please note that the same problematic scenario may also happen if ISA Server acts as the VPN Server and the PPTP client is located behind a router device doing NAT (the client tries to connect from home for instance) What is causing the issue? In order to understand the cause of the problem here, it is important to remember that PPTP uses a Call ID field in the GRE header to identify the PPTP tunnel associated to a packet. For a PPTP connection, there are two different values for the Call ID field. One value is used for data sent by the PPTP client and the other is used for data sent by the PPTP server. To handle situations where multiple PPTP clients are behind a NAT device, the NAT device translates the PPTP Client Call ID the same way it would translate TCP or UDP ports. By translating this Call ID, the NAT device ensures a unique Call ID is used for each PPTP tunnel, and for each PPTP client. In the scenarios described above, the root cause is because the third party router doing NAT incorrectly changes the Call ID inside the PPTP Set-link-info packets. As a result, the PPTP application filter of ISA Server will detect that the Call ID is incorrect, and will take the decision to drop the connection. Gathering network traces from both sides of the
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