ERROR_IPSEC_MM_FILTER_EXISTS - 13006 (0x32CE)
The specified main mode filter already exists.
Updated: Feb 21, 2026
Technical Meaning
This error code indicates that an attempt was made to create or modify a main mode filter in the Internet Protocol Security (IPsec) system, but the specified filter already exists. The IPsec Main Mode Filter is used for configuring security policies and rules for IPsec connections.
Error Details
The ERROR_IPSEC_MM_FILTER_EXISTS error code is returned when an operation to add or update a main mode filter fails because the filter with the same name or configuration already exists in the system. This can occur during the setup or modification of IPsec policies and rules.
Usage Context
This error typically occurs in scenarios where administrators are configuring or modifying IPsec settings, such as when setting up security associations (SAs) for IPsec tunnels or when applying new security policies to existing connections.
Developer Interpretation
When encountering this error, developers should ensure that the filter name and configuration parameters are unique. This can be achieved by verifying the existence of a filter with the same name before attempting to create or modify it. Additionally, checking for any conflicting configurations or overlapping rules can help in resolving the issue.
Related Errors
ERROR_IPSEC_SA_NOT_FOUND(13004 - 0x32C8): Indicates that an IPsec security association was not found.ERROR_IPSEC_MM_FILTER_NAME_CONFLICT(13007 - 0x32CF): Occurs when a main mode filter name conflict is detected.
FAQ
Q: What does the ERROR_IPSEC_MM_FILTER_EXISTS error mean?
A: It indicates that an attempt was made to create or modify a main mode filter, but the specified filter already exists in the system.
Q: How can I resolve this error?
A: Ensure that the filter name and configuration parameters are unique before attempting to create or modify the filter. Verify for any existing filters with the same name and adjust the configuration accordingly.
Summary
The ERROR_IPSEC_MM_FILTER_EXISTS error code is a specific technical issue related to IPsec main mode filters in Windows systems. It indicates that an attempt was made to add or update a filter, but the specified filter already exists. Developers should ensure unique names and configurations when working with IPsec settings.