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    Wednesday, October 10, 2012

    How to Fix "Informational Exchange message must be encrypted"

    This is the error you might get while configuring Openswan. As I received this error when I was configuring openswan to connect my sonicwall vpn.


    #1: Informational Exchange message must be encrypted

    Make sure you have set these parameters in your Sonicwall 
    IKE (Phase 1) Proposal
    DH Group: Group 5 (not 2)
    Encryption: 3DES
    Authentication: SHA1
    Life Time: 28800

    Ipsec (Phase 2) Proposal
    Protocol: ESP
    Encryption: 3DES
    Authentication: SHA1
    Check "Enable Perfect Forward Secrecy"
    DH Group: Group 5
    Life Time (seconds) 28800

    Check these parameters in your linux machine
    # vi /etc/ipsec.conf
           esp=3DES-SHA1            # protocol used for authentication in sonicwall

    To view a screenshot of this page on sonicwall click on the following link

    To have a look at all the configuration files and steps follow this page:
    openswan configuration in Red Hat linux

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