Issue
1. Scheduled workflows are not running and log a message "Failed to Run"
2. When a users action tasks they see a message l "Your task has been locked by another user".
2. When a users action tasks they see a message l "Your task has been locked by another user".
Resolution
Restart the Microsoft SharePoint Foundation Workflow Timer Service on all servers where it is found.
Error Code
Error establishing database connection: SQL Error -2. System.Data.SqlClient.SqlException: Timeout expired.
Additional Information
When checking the Timer Job Status page in Central Administration it may be found the the Nintex Workflow Scheduler job may be in a status of Aborted. and the Workflow job may be paused.