End of Sale Notice:

F5 NGINX is announcing the End of Sale (EoS) for NGINX Management Suite API Connectivity Manager Module, effective January 1, 2024.

F5 maintains generous lifecycle policies that allow customers to continue support and receive product updates. Existing API Connectivity Manager Module customers can continue to use the product past the EoS date. License renewals are not available after September 30, 2024.

See our End of Sale announcement for more details.


This topic describes possible issues users might encounter when using API Connectivity Manager. When possible, suggested workarounds are provided.

System returns 403 Forbidden error for authorized resources


Users are unable to access API Connectivity Manager features that they’ve been granted permission for.

The system returns errors similar to the following examples:

  • Web interface error: “ACM license not found.”

  • API error: “Error accessing resource: forbidden. Please contact the system administrator. User has not been granted READ permission.”


New roles require a minimum of READ access for the Licensing feature. Without READ access for Licensing, users will be unable to access pages for which they have been granted permission; instead, the system will return 403 Forbidden errors as licensing errors.

API Connectivity Manager module doesn’t show up in the web interface


After installing the API Connectivity Manager module, the module doesn’t appear in the NGINX Management Suite web interface.


  • Force refresh the web page.

  • Restart the API Connectivity Manager service:

    sudo systemctl restart nms-acm

Routing traffic fails with RangeError: Maximum call stack size exceeded in the data plane error logs


After deploying an API Proxy using a large OpenAPI Specification or a large number of advanced routes, traffic fails to route to the backend service and instead returns a 404 error. Failed requests trigger js exception: RangeError: Maximum call stack size exceeded in the data plane logs.

The number API proxy advanced routes which can be deployed to a single API proxy is dependent on the complexity of the configuration, so it is not possible to give an exact limit; however, the table below illustrates some limits based on example configurations. For example, if all of your routes support a single method and have two non-enum query parameters, your configuration should be able to support up to 440 routes per API proxy. Enum parameters are not illustrated in the table below but will reduce the number of supported routes more significantly than a non-enum parameter.

Path/Route methods Query parameters Supported number of Paths/Advanced Routes
1 0 1100
1 1+ 440
2 0 550
2 1+ 220
3 0 360
3 1+ 140
4 0 270
4 1+ 110
The numbers in the above table are provided only as an example. Other factors may impact the total supported number of routes.


  • The limitations are for a single API proxy. Splitting your configuration and deploying it across multiple API proxies may resolve the issue. For example:
    • Given an OpenAPI specification with contains 1500 routes with a single method and no parameters
    • 800 paths in the specification begin with /v1, and 700 begin with /v2
    • Splitting the definition into two definitions, with one containing all of the /v1 paths and the other containing all of the /v2 paths, should allow deployment of two API proxies which cover all of the paths defined, each one below the 1100 route limit
  • Replacing enum parameters with non-enum parameters may increase the number of routes which can be deployed

Can’t delete API Connectivity Manager objects after upgrading NGINX instances


After upgrading NGINX Plus instances to R27, you may not be able to delete Environments, Proxies, or Dev Portals in the API Connectivity Manager module.


Try restarting the NGINX Agent after upgrading NGINX.

  • To restart the NGINX Agent, run the following command:

    sudo systemctl restart nginx-agent

How to Get Support

If you need additional assistance, refer to the following topics for guidance on how to contact Support and create a Support Package: