Troubleshooting Tip: Resolving the FortiSandbox error 'Firmware upgrade Failed: Failed to fetch checksum for image.'

Description

This article describes the steps and recommendations to prevent the error 'Firmware upgrade Failed: Failed to fetch checksum for image' when updating a FortiSandbox.

The errors in the GUI may be similar to the following:

The Errors in Logs & reports -> Events -> System Events are similar to the following:

Scope

FortiSandbox.

Solution

This error is observed during the update process when the firmware has an error.

The validation process is as follows:

Within the Support Portal, obtain the image and the Hash value (in this case SA_2000E-v400-build0423-FORTINET.out).

Once these values have been obtained through Windows PowerShell, they must be validated with the following command:

((Get-FileHash "image_name.out" -Algorithm md5).Hash) -eq "hash_md5"

For this example: FSA_2000E-v400-build0423-FORTINET.out.

The output should be 'True' as shown in the following output:

Important: As the main recommendation, the use of VPNs should be avoided when uploading firmware during the maintenance window.