05-12-2021 01:20 AM
Hi @Lukaszm1 ,
The log you have shared doesn't contain any error. It indicates that FW is trying to negotiate Phase1. The key point here is that FW is starting the negotiation ("as initiator"), due to the nature of the IPsec the initiator will not log the real reason why negotiation is failing.
You can try to enable passive mode under the IKE Gateway advance options - this will force the firewall to act only as responder and waits for the Azure to trigger negotiation. That way you should see more "detailed" log what could be the reason for the unsuccessful negotiation. Note that in thi case you need to find a way to tell Azure to start first - either by sending traffic from azure to on-prem network or by any "azure troubleshooting commands".
