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 is found on the System Configuration > Miscellaneous > L7 Configuration screen in the WUI.

When this option is enabled, LoadMaster severs all existing connections to a disabled server after the L7 Connection Drain Time is reached. Clients are then forced to re-establish a connection to one of the remaining Real Servers. You can configure the L7 Connection Drain Time by going to the following screen in the WUI: System Configuration Miscellaneous Options > L7 Configuration.

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.