Most RecentMost ViewedMost LikesTCP Port Is Already In Use First published on MSDN on Oct 05, 2016 It's 3 AM on a Saturday morning and you receive that dreaded phone call – "The SQL Server just had maintenance. Microsoft Excel, TLS & SQL Server - Important Considerations First published on MSDN on Sep 27, 2017 BackgroundAs you may know, TLS 1. Login Failed for xxx - Who's Keeps Trying to Connect to my Server? First published on MSDN on May 04, 2017 I recently ran into an issue in which a machine was connecting to SQL and continuously generating a login failure every second.