|Product:||Windows Operating System|
|Component:||Security Event Log|
|Message:||IKE security association establishment failed because peer sent invalid proposal. Mode: %1 Filter: %2 Attribute: %3 Expected value: %4 Received value: %5|
This error occurred because it was impossible to agree on the security attributes necessary for protecting the traffic. The Attribute value shows which attribute was under contention. The Expected value shows what was expected, and the Received value shows what value the peer sent.
Review the configured IPsec policies on both computers for the attribute (and mode) in question.