MACROMEDIA COLDFUSION 4.5-ADMINISTRING COLDFUSION SERVER Manual page 282

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6. Click the Administration link.
The Server Administration page appears for the selected server.
7. Select Restricted from the Restriction Status drop-down box and click OK.
The selected server will no longer participate in the cluster and will not receive
HTTP requests until you change its status back to Unrestricted.
Administering ColdFusion Server