IPsec Tunnel on Fortigate not working

Posted on 2011-10-12
Last Modified: 2012-06-27

The IPsec tunnel on the Fortigate box is not working properly. It was working before and nothing has changed on the network. I have checked the logs on the dial up client (Fortigate box), I get the following message:

Initiator: parsed aggressive mode message # 1 (error)
Negotiate SA Error: probable pre-shared secret mismatch

On the Server (Fortigate box) the log is giving me this message:

Responder: parsed main mode message # 3 (error)
How can I make the tunnel go up again?

On the Server
Question by:alee0786
    LVL 14

    Accepted Solution

    setup the tunell from scratch? probable pre-shared secret mismatch
    it is never "nothing has changed"
    check if both sides are set to aggressive mode or try to change the authentication algorythms

    Author Comment

    OK, I have setup the tunnel from scratch almost 6-7 time already but same result. On the Server logs I am getting the following:

    Received error notification from Peer: Invalid Hash Information.

    I have checked and it is set to aggressive mode.
    LVL 14

    Expert Comment

    that means in general that the passwords do not match. chek your passwords if they are the same or if they are not too long

    Author Comment

    Now I tried setting it up to different authentication algorithm and it started working.

    So far so good, it is holding up.

    Thanks a lot.  
    LVL 67

    Expert Comment

    This question has been classified as abandoned and is closed as part of the Cleanup Program. See the recommendation for more details.

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