Skip to main content

FSTL100 - Failed to Read the Fastly ACL

Agent error code #FSTL100 indicates the agent could not list the ACLs on the service's active version, so it could not resolve the configured ACL name to an ACL.

Common causes include:

  • The token can read the service but not its versioned configuration
  • A transient API failure

Steps to Resolve

  1. Confirm the API token has write access to the service's configuration, not just read access to the service
  2. Run Validate connection in the Knoc wizard, which names the ACLs it can see on the active version
  3. If the failure persists with a working token, check Fastly's status page
Back to top