ERROR_IPSEC_TRANSPORT_FILTER_EXISTS - 13008 (0x32D0)
The specified transport mode filter already exists.
Updated: Feb 21, 2026
Technical Meaning
The error code ERROR_IPSEC_TRANSPORT_FILTER_EXISTS indicates that a transport mode filter, which is used in the Internet Protocol Security (IPsec) framework to provide security services for IP packets, already exists within the specified context. This typically occurs when an attempt is made to add or modify a filter that already has an identical configuration.
Error Details
This error code is specific to the Windows operating system and its implementation of IPsec. It suggests that there is a conflict in the configuration process due to duplicate entries for transport mode filters, which are essential components for establishing secure communication channels over IP networks.
Usage Context
The ERROR_IPSEC_TRANSPORT_FILTER_EXISTS error can be encountered during various operations involving IPsec policies and filters, such as configuring security associations or modifying existing filter settings. It is important to ensure that the configuration details provided match exactly with an existing entry for this error to occur.
Developer Interpretation
Developers should interpret this error code as a sign that the operation being attempted has failed due to a duplicate transport mode filter. This could be caused by attempting to add or modify a filter that already exists, possibly due to incorrect configuration or mismanagement of IPsec policies. Developers are advised to review and validate their input parameters to ensure they match existing configurations.
Related Errors
ERROR_IPSEC_FILTER_NOT_FOUND(13007 - 0x32CE): Indicates that a requested filter does not exist, which could be the opposite scenario of this error.ERROR_IPSEC_INVALID_POLICY(13016 - 0x3348): Suggests an invalid policy configuration, which might also lead to issues with transport mode filters if improperly configured.
FAQ
Q: What does the ERROR_IPSEC_TRANSPORT_FILTER_EXISTS error mean?
A: It indicates that a transport mode filter already exists in the specified context, preventing the addition or modification of a duplicate entry.
Q: How can I resolve this issue?
A: Review and validate your input parameters to ensure they match existing configurations. Ensure there are no duplicates before attempting the operation again.
Summary
The ERROR_IPSEC_TRANSPORT_FILTER_EXISTS error code is specific to IPsec operations in Windows, indicating a conflict due to duplicate transport mode filters. Developers should focus on validating their configuration details and ensuring uniqueness when managing IPsec policies.