In most cases information about failed logins can be found in the errorlog of SQL Server. However, if your SQL Server is working with TLS then if the login fails with a handshake error, you will not find this failed login attempt in the errorlog of SQL Server. You can find these types of login…
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Rarely occurring login issues in SQL Server are hard to explain when there is no significant load on the Instance or its host. A good idea for troubleshooting is using extended events, symbol files and the sysinternals tool, procmon. For some applications it is crucial to have a login timeout of less than 5 seconds….
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