Hey @sheidari ,
Are you able to open the gallery in any other way?
What version have you upgraded from?
Have you gone through the backup and recovery?
I suggest you look if the services are down. Other than that, you can take a look in the logs to see what is really happening there.
https://help.alteryx.com/20203/server/configure-and-use-server-logs
Best,
Fernando Vizcaino