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I would check all the filters and rules to see what traffic you are blocking.<br />
<br />
<br />
I hope this helps !
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I would check all the filters and rules to see what traffic you are blocking.


I hope this helps !

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ALso check the relevant logs<br />
<br />

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Thanks for your answer.<br />
<br />
No, nothing blocks this kind traffic. I can successfully establish VPN with other VPN servers using PPTP ... the only problem is with this Zyxel.
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Thanks for your answer.

No, nothing blocks this kind traffic. I can successfully establish VPN with other VPN servers using PPTP ... the only problem is with this Zyxel.

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Hi Experts,<br />
<br />
My organization has a ISA Server 2006 as a firewall, working with two interfaces, internal and external. We have internal computers establishing VPN connection with other external VPN servers, but when the other VPN end is a Zyxel router/firewall, the VPN can not be established, showing error 619 on the origin (the Windows XP computer trying to establish a PPTP VPN). If we stop the ISA Server and configure our router to work without the ISA Server, this VPN connection is established without problem. We allways use NAT.<br />
<br />
Any idea about what's happening with ISA Server?<br />
<br />
Thanks in advance.
</div>
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Hi Experts,

My organization has a ISA Server 2006 as a firewall, working with two interfaces, internal and external. We have internal computers establishing VPN connection with other external VPN servers, but when the other VPN end is a Zyxel router/firewall, the VPN can not be established, showing error 619 on the origin (the Windows XP computer trying to establish a PPTP VPN). If we stop the ISA Server and configure our router to work without the ISA Server, this VPN connection is established without problem. We allways use NAT.

Any idea about what's happening with ISA Server?

Thanks in advance.

Problem with VPN connections throught a ISA 2006 server

Microsoft Forefront, formerly known as Internet Security and Acceleration Server (ISA Server), is a network router, firewall, antivirus program, VPN server and web cache that runs on Windows servers. It includes identity management and protection systems, and discontinued systems for threat management and network protection, along with protection for Sharepoint and Exchange. The scope of discussions includes forward and reverse proxy, application and service publishing, virtual private networks (VPNs), outbound access rules, SSL certificates and network routing within either a single node or an highly-available array pairing.

Microsoft Forefront ISA Server

A virtual private network (VPN) is a network that uses a public telecommunication infrastructure, such as the Internet, to provide remote offices or travelling users access to a central organizational network securely. VPNs encapsulate data transfers using secure cryptographic methods and other security mechanisms to ensure that only authorized users can access the network and that the data cannot be intercepted.