Increase number of Workers for Standard Manager (Administer Concurrent Managers)

Step 1: Login system, go to system administrator > Concurrent > Manager > Define

Step 2: Write down “Standard Manager” in Manager field and execute 

Step 3: Press “Work Shifts” button and open a new window

Step 4: Increase the Processes column to required number. (In following case 10 Concurrent Requests can run at once) and save

Step 5: Result (worker increased 10 to 12)