Refused Connection: A refused connection typically indicates a mismatch in the TCP port

configuration between the FortiGate and the collector agent. Ensuring both are configured to use the

same TCP port is crucial for proper connectivity.

Mismatched Pre-Shared Password: If the pre-shared password configured on the FortiGate does not

match the one set on the collector agent, authentication will fail, leading to connectivity issues.

Inability to Reach IP Address: This can occur due to network issues such as incorrect routing, firewall

rules blocking traffic, or the collector agent being down. Verifying network connectivity and the

status of the collector agent is necessary to resolve this issue.

Reference:

Fortinet Community: Troubleshooting FSSO Connectivity Issues​(Welcome to the Fortinet

Community!)​​(Welcome to the Fortinet Community!)​​(Welcome to the Fortinet Community!)​.