Sir , I have checked , all the services are running and also courses are being displayed properly.
But it suddenly will be stopped , I don't know the exact reason for it.
Recently, I have changed the encryption algorithm from default to MD5 without salt method for the new sign-up.
Also I have tried to connect the MySQL database of openedx through external java pages and updating auth_user table of openedx database though the separate signup page created in java.
I am guessing, this can be reason for my issue . Please confirm from your expert opinions. I have not any troubleshooting experience of openedx as I am novice developer.