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VPN Tunnel between pix 515 and nortel

I am using cisco pix and in other end they are using net nortel. i am trying to configure site to site VPN using pre shared key and i am getting

ISAKMP: error, msg not encrypted

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Re: VPN Tunnel between pix 515 and nortel

1.Check the identity option ,change it to hostname if configured as ip address

2. Change the ISAKMP key to numeric eg :1234 if alphabetic , probably the Nortel FW does not like special characters or'Cap" letters

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