Once the ticket has been solved, CAST Technical Support sets the status to Solved. In your tickets list, in your My activities page, the ticket is marked as SOLVED as below:
You can add comment in a Solved ticket, as long as the ticket was solved less than 28 days ago. The status gets set to open, as below:
If the ticket was solved more than 28 days ago, the ticket can not be reopened. You will create a follow-up of this ticket.