Microsoft SQL Server database ranks third in the relational database, second only to Oracle and MySQL database. when using it, it is inevitable to encounter various problems and warnnings. You may be dba or a developer, I hope this content can help you solve SQL Server error number 18401.

Error number: 18401

Severity level: 14

Event logged: Login failed for user ‘%.*ls’. Reason: Server is in script upgrade mode. Only administrator can connect at this time.%.*ls