Hello.

I have a problem with SQL Server. I'm unable to connect to it. The "error:18456,severity" appears. What does this message mean? Is there something I can do myself to recover SQL Server?

Any help you anyone can provide would be great.

any help?

It could mean lots of tons... Check from d list according to the error number...

1 'Account is locked out'
2 'User id is not valid'
3-4 'Undocumented'
5 'User id is not valid'
6 'Undocumented'
7 'The login being used is disabled'
8 'Incorrect password'
9 'Invalid password'
10 'Related to a SQL login being bound to Windows domain password policy enforcement.
See KB925744.'
11-12 'Login valid but server access failed'
16 'Login valid, but not permissioned to use the target database'
18 'Password expired'
27 'Initial database could not be found'
38 'Login valid but database unavailable (or login not permissioned)'

https://www.fixtoolbox.com/sqlserverfix.html
It recovers databases of SQL Server format.

Thanks for detailed replies

While trying to connect with the SQL server, we often see a pop-up message “linked server login failed error 18456”. Do you know why this error occurs, and are you looking for a solution to error 18456? To learn about methods to fix Microsoft SQL server error 18456, read the whole Write-up.