Troubleshooting Tip: Error Code '-155' when uploading a CA Certificate on FortiGate due to System Time mismatch
| Description | This article explains how to troubleshoot error code '-155' that occurs when uploading a CA certificate to FortiGate. The issue is caused by a mismatch between the system time and the certificate’s validity start time. |
| Scope | FortiGate. |
| Solution | When uploading a CA certificate to FortiGate, an error '-155' may occur in certain scenarios.
This issue occurs because the FortiGate system time is behind the certificate’s validity start time.  To resolve the issue, make sure the certificate's validity start time is either behind or same as FortiGate's System Time.   Another solution is to modify the system time on FortiGate. Navigate under System -> Settings and manually set the system time.  |