Checked the error encountered by the user in the web application, as per checking, it is a token error. Backed up the incentives prod from server 11.120, while backing up, created the session table in the store_incentive database. After the backup is done, modified the env and change the session drive from files into the database. After changing, deployed the changes into the server then execute the clear cache command. Sought assistance from Omar of Infra to check if there are problems in the server as I can't log in on it and typing the command in putty is taking time. Received advice from Omar that the server has no problem but he restarted the httpd services, after restarting it, I can now connect to the server and execute the clear cache command. After executing the command, advised the user to try to access the web application again, as per the user, they can now access it.