Cannot connect to (LocalDB)\MSSQLLocalDB -> Login failed for user 'User-PC\User'

sql

sql-server

localdb

connection-issues

byAnton Shumikhin·Nov 13, 2024

The Login failed for user 'User-PC\User' error with (LocalDB)\MSSQLLocalDB commonly arises from instance unavailability or insufficient user permissions.

Rapid remedy: Initiate the LocalDB instance with sqllocaldb start MSSQLLocalDB and ascertain User-PC\User has access.

Permission setup:

USE master;
// Mama always said, user permissions are like a box of chocolates.
// You never know what you're gonna get.
CREATE LOGIN [User-PC\User] FROM WINDOWS;
// Granting some omnipresent cosmic powers.
ALTER SERVER ROLE sysadmin ADD MEMBER [User-PC\User];

Executed in SSMS by an admin, the above bestows User-PC\User with temporary sysadmin powers, or adjust with specific roles and databases as needed.

Tracking down service stutters

Service Status Verification: Give the SQL Server service status a glance. If dormant, awake it through services.msc.

Manual database connection: No 'master' in sight? Fear not, manually key it in under 'Connect to database' in SSMS.

Getting cozy with LocalDB characteristics

Instance investigation: Apply sqllocaldb info MSSQLLocalDB to authenticate LocalDB instance's existence and status.

Deletion discretion: Tread lightly when exterminating databases for debugging; contemplate the consequences and backup data first.

Ironing out SSMS and LocalDB wrinkles

Refreshing SSMS: A quick restart of SSMS might just breathe new life into those pesky, declining connections.

Connection check: Ensure that (LocalDB)\MSSQLLocalDB is the chosen selection in SSMS Connection Properties.

Guarding against user goof-ups

Change chronicle: Scrutinise recent system modifications or software alterations with the potential to upset SQL Server logins.

Credential confirmation: Validate User-PC\User's credentials. A mere typo can herald a frustrating lockout.

Calling for reinforcements

Call in the experts: Consistent connectivity conundrums? Don't shy away - reach out to experienced developers or DBAs.

Resource richness: Harness the power of comprehensive resources for in-depth insights and sophisticated troubleshooting tactics.

explain-codes / Sql / Cannot connect to (LocalDB)\MSSQLLocalDB -> Login failed for user 'User-PC\User'

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