Typically, a CIFS connection made with the old authentication method will remain valid as long as there is at least one file open. Once disconnected, any new connections will use the new authentication settings. That's not hard and fast, as some code levels may prevent opening any new files on existing connections, and any new connections will use the new settings. All-in-all it is safer to assume disruption and make the change after hours.
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Daniel Rich | Manager
Enterprise Storage and Data Protection
Citizens Property Insurance Corporation
Mobile: 904.373.8855
Work: 904.328.2555
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