Important note about SSL VPN compatibility for 20.0 MR1 with EoL SFOS versions and UTM9 OS. Learn more in the release notes.

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malformed payload in packet. Probable authentication failure (mismatch of preshared secrets?)

Izuchukwu Edeh

I am trying to configure ipsec Site-to-site VPN between the Head and branch offices. The Head office is a Sophos UTM SG 210 configured as the responder (Repond-Only), and the branch Firewall is a Sophos XGS configured as the initiator.

The Head office SG210 firewall had three other site-to-site VPN connections all in respond-Only mode to the SG210

After the configuration was established the following error Log kept showing:

NAT-Traversal: Result using RFC 3947: no NAT detected
#37767: next payload type of ISAKMP Identification Payload has an unknown value: 187
#37767: Preshared secret failed to decrypt message. Trying next one.
#37767: next payload type of ISAKMP Identification Payload has an unknown value: 93
#37767: malformed payload in packet. Probable authentication failure (mismatch of preshared secrets?)
#37767: sending encrypted notification PAYLOAD_MALFORMED to 188.155.89.10:500
#37767: next payload type of ISAKMP Identification Payload has an unknown value: 93
#37767: malformed payload in packet. Probable authentication failure (mismatch of preshared secrets?)
Please I need help with the solution


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