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ERROR_IPSEC_IKE_DROP_NO_RESPONSE
ERROR_IPSEC_IKE_DROP_NO_RESPONSE means Windows sent an IKE negotiation message but did not receive a response from the peer. Typical causes are an unreachable peer, firewall/NAT filtering, a wrong peer address, or a remote service that is not listening for IKE.
What to check
- Verify the peer address and route, then verify the network path permits IKE/IPsec traffic.
- Capture traffic at both endpoints to find where the request or reply stops.
- Do not diagnose this as a certificate error unless the trace shows that the peer received and rejected authentication.
netsh trace start scenario=NetConnection capture=yes tracefile=C:\Temp\ipsec.etl
... reproduce the failure ...
netsh trace stopMicrosoft: Use Netsh to manage network traces
Microsoft: IPsec IKE system error codes
Microsoft: Connection security rules
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