How can I confirm that all Cron Jobs working fine?
As synchronization of accounts stopped suddenly. All things were working fine earlier.
Have a look in your MySQL Database and look for table called
There are all Magento created jobs with timestamp of creation, scheduled, executed and their status.
To restart the cron service, use:
OR RHEL/CentOS 5.x/6.x user:
service crond restart
OR RHEL/Centos Linux 7.x user:
systemctl restart crond.service
Make sure that you have your cron job properly set-up and is working on the server. Otherwise, none cron will run.