
This is done to prevent any kind of information from being disclosed to the potentially unauthenticated clients logging in to the SQL Server. The message is structured in an undescriptive manner. On the failure of login performed on the server, the client shows up the following error message: Therefore, below given are some of the possible explanations on the whys and wherefores of the SQL Server error code 18456. Unfortunately, Microsoft doesn't offer error messages that could be useful. Technically any error is converted to a state 1 error unless the server logging is checked, thus, the same happens with the discussed eventID too. This condition is caused by a number of possible reasons. The failure encountered during a login performed on SQL Server, at most times, means that the server successfully received the connection request mentioned by you however it isn't able to give you the access. Understanding SQL Server Login Failed Error 18456 Therefore, this piece of segment shares information about SQL Server Error 18456 along with the consequences of it and the possible fixes that can be applied to it. This could be because you don't have enough rights or the credentials used are not correct.


When trying to connect to Microsoft SQL Server encounters you with an error 18456 that probably points towards authentication issue.
