there was an error retrieving the jobs in fmeserver 2017

The logs would suggest that the Database service got shut down. Are you on a distributed system? You will need to restart the Database Service.

I suggest you try to restart FME Server and see if that solves the problem.

Thank you, after restarting, I still can't load the jobs page, and the developer page reports an error message such as an attachment, I don't know if I need to configure it in the domain name environment, and how to configure it。

Maybe have a run through of this: https://community.safe.com/s/article/fme-server-troubleshooting-guide

Without knowing specifics of your environment it's a bit hard to understand what the issue is