ERROR_IPSEC_IKE_CRITICAL_PAYLOAD_NOT_RECOGNIZED - 13823 (0x35FF)
Don't know how to process critical payload.
Updated: Feb 21, 2026
Technical Meaning
This error code indicates that a critical payload in the Internet Protocol Security (IPsec) or Internet Key Exchange (IKE) negotiation process was not recognized by the system. IPsec and IKE are protocols used for secure communication over networks, particularly for establishing secure tunnels between network endpoints.
Error Details
The error ERROR_IPSEC_IKE_CRITICAL_PAYLOAD_NOT_RECOGNIZED is a generic return code that signifies an issue with the processing of critical payloads during the negotiation process. Critical payloads contain essential information required for the establishment or maintenance of a secure connection, and their recognition is crucial for the protocol's functionality.
Usage Context
This error typically occurs in scenarios where IPsec/IKE negotiations are being conducted between network endpoints. The error can be encountered when attempting to establish a secure connection over a network using these protocols. It may also appear during troubleshooting or maintenance activities related to IPsec/IKE configurations.
Developer Interpretation
When this error is returned, it suggests that the system was unable to process a critical payload correctly. This could indicate issues with the input data, configuration settings, or the protocol itself. Developers should interpret this error as an indication of a failure in the negotiation process and investigate further to determine the root cause.
Related Errors
ERROR_IPSEC_IKE_NEGOTIATION_FAILED(0x80350401)ERROR_IPSEC_IKE_PROCESSING_ERROR(0x80350426)ERROR_IPSEC_IKE_AUTH_FAILURE(0x80350417)
FAQ
Q: What does the error code 0x35FF mean?
A: The error code 0x35FF, or ERROR_IPSEC_IKE_CRITICAL_PAYLOAD_NOT_RECOGNIZED, indicates that a critical payload in an IPsec/IKE negotiation was not recognized by the system.
Q: How can I troubleshoot this issue?
A: Review the context of the negotiation and ensure all parameters are correctly configured. Check for any corrupted data or incorrect usage of the protocol.
Summary
The ERROR_IPSEC_IKE_CRITICAL_PAYLOAD_NOT_RECOGNIZED error is a generic return code indicating an issue with processing critical payloads during IPsec/IKE negotiations. Developers should interpret this as a failure in the negotiation process and investigate further to determine the root cause.