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ERROR_IPSEC_IKE_PROCESS_ERR_VENDOR
ERROR_IPSEC_IKE_PROCESS_ERR_VENDOR means the Vendor ID payload from the peer could not be processed. Vendor IDs advertise implementation-specific capabilities and extensions; a failure can signal an incompatible or malformed peer extension.
Vendor ID failures are most useful when tied to the exact peer build and advertised extension. Compare a working and failing negotiation after firmware or VPN-software changes to identify which implementation-specific behavior changed.
What to check
- Capture the exchange to identify the Vendor ID and the peer implementation sending it.
- Check for VPN gateway firmware or configuration changes that enabled nonstandard extensions.
- Verify the peer is negotiating the intended IKE version and not a conflicting compatibility mode.
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