You can use sp_configure with RECONFIGURE to display or change server-level settings. However, some configuration options require a server stop and restart to update the currently running value. RECONFIGURE does not always update the currently running value. Another option is to use RECONFIGURE WITH OVERRIDE statement for the change to take immediate effect. For example:
EXEC sp_configure ‘resource timeout’, 80
RECONFIGURE WITH OVERRIDE
However, you should use this option with caution as it disables configuration value checking for invalid values or for non recommended values and forces the reconfiguration with the specified value.