If you connect to SQL Server 2017 by using Integrated Authentication, TCP Timeout or login time-out error may occur. After you apply Cumulative Update (CU) 14, Active Directory (AD) lookup will switch to pre-emptive mode and avoid non-yield errors in TCP close call.
Cumulative Update Information:
This issue is fixed in the following cumulative update for SQL Server:
About cumulative updates for SQL Server:
Each new cumulative update for SQL Server contains all the hotfixes and all the security fixes that were included with the previous cumulative update. Check out the latest cumulative updates for SQL Server: