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ERROR_IPSEC_IKE_PROCESS_ERR_DELETE
ERROR_IPSEC_IKE_PROCESS_ERR_DELETE means a peer sent a delete payload that Windows could not process. Delete messages are used during SA teardown and rekeying, so this can appear during a tunnel transition rather than initial setup.
What to check
- Check whether the failure occurs during rekey, disconnect, or policy refresh rather than initial negotiation.
- Compare SA lifetimes and rekey behavior on both peers.
- Capture the delete message to determine which SA identifiers the peer attempted to remove.
Get-NetIPsecMainModeSA
Get-NetIPsecQuickModeSA
Microsoft: Get-NetIPsecMainModeSA
Microsoft: Get-NetIPsecQuickModeSA
Microsoft: Use Netsh to manage network traces
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