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VPN 3000 and ISA Server


Thanks for any reply in advance. I had my VPN 3005 client working great until I installed a new MS ISA server on my network. Even after turning off the ISA server there is still a problem with the VPN client connecting to the Windows 2000 domain. On the client IPSec Log I recieve a ISAKMP error stating "no keys are available to decrypt the recieved ISAKMP payload". What I'm looking for is a good suggested starting point for trouble shooting. I am new to VPN and IPSec so any help would be greatly appreciated.



Re: VPN 3000 and ISA Server

Often times complex troubleshooting issues are best addressed in an interactive trouble-shooting session with one of our trained technical assistance engineers. While other forum users may be able to help, it’s often difficult to do so for this type of issue.

To utilize the resources at our Technical Assistance Center, please visit and to open a case with one of our TAC engineers, visit

If anyone else in the forum has some advice, please reply to this thread.

Thank you for posting.

Re: VPN 3000 and ISA Server

What do you mean "turn off ISA"? Either you have removed it from the config or are you saying that you have stopped some of it's services and believe it is letting all traffic through? My first guess is that if it still is physically connected and traffic is flowing through it that the firewall feature of ISA is not allowing the needed traffic through. Try taking ISA out of the equation and see what happens.

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