Access the Administration Console
Select a server from the list of servers and click the Manage button.
Click the Restrict Access link under the Preferences tab
Select the Edit option from the drop-down list and click the OK button
Select The entire server option from the method A table and click the Edit Access Control button
Click the access rights (r-x--i) link under the Rights column
Access Rights table appears at the bottom of the screen.
Deselect the WRITE and DELETE options
Click the Update button
Click the Submit button
Click the Apply link present at the top right of the screen and click the Apply Changes button to make the changes permanent
Restart the server for changes to take effect