Hi there @alimuratyesilyurt,

To me, it looks like your service is not running at the moment. It depends on what software stack you are using, but I think that it is a matter of starting your service.

It is possible that your service is not configured to start automatically after a reboot, this would explain why you are seeing this error after the restart of the Droplet.

As a side tip on how to figure out how to start your service is to SSH to your Droplet and run the history command, that way you will see what commands were used in the past and possibly figure out the command that you need to start your service again.

Regards,
Bobby