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ERROR_IPSEC_IKE_DECRYPT
ERROR_IPSEC_IKE_DECRYPT (0x0000362B) Windows received an encrypted IKE payload that it could not decrypt. This often follows a mismatch in negotiated state, stale peer state, packet corruption, or an intermediary that causes packets from different exchanges to be mixed.
What to check
- Check whether both peers recently rekeyed, restarted, or changed policy while the exchange was in progress.
- Inspect NAT, load balancer, and asymmetric-routing conditions that can disturb IKE state.
- Use a trace from both ends to compare cookies, message IDs, and the selected proposal.
netsh trace start capture=yes scenario=InternetClient
Microsoft: Netsh network tracing
Microsoft: Audit IPsec Main Mode
Microsoft: IPsec/IKE system error codes
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