By default existing connections are not closed when a real server is disabled. This can lead to issues with Outlook clients if an Exchange CAS server is administratively disabled. A solution to this is to enable the Drop at Drain Time End option which can be found on the System Configuration > Miscellaneous > L7 Configuration screen in the WUI.

When this option is enabled, LoadMaster will sever all existing connections to a disabled server after the L7 Connection Drain Time is reached. Clients will then be forced to re-establish a connection to one of the remaining Real Servers.

For further details on the Drop at Drain Time End and L7 Connection Drain Time fields, refer to the L7 Configuration section of the WUI Configuration Guide.