Fix Login Failed SQL Server Error 18456 Quickly

What Is Login Failed SQL Server Error 18456?

This error means that your login attempt to the SQL Server failed. It occurs, like: Login failed for user SQL Server Error 18456. (Microsoft SQL Server, Error: 18456)

It can happen for many reasons, wrong username, a wrong password, incorrect login settings, or even server issues.

Common Causes of SQL Login Failed Issue

Here are a few of the most common reasons for this error:

• Wrong username or password.
• The user account doesn’t exist in SQL Server.
• The server only allows Windows Authentication.
• User doesn’t have permission to access the database.
• Also, when your SQL database is damaged or corrupted.

Fix Microsoft SQL Server Error 18456: How to Fix Manually

There are several manual methods available to fix this error. You can try each method for 100% accuracy:

Method 01: Double-Check Your Login Credentials

Make sure:

1. The username is typed correctly.
2. The password is accurate (no extra spaces or special character issues).
3. Also, Caps Lock is turned off.

Sometimes, even a small typo causes the login to fail.

Method 02: Enable SQL Server Authentication Mode 

SQL Server supports two types of authentication:

• Windows Authentication.
• Mixed Mode (Windows + SQL Server Authentication).

How to Fix it:

1. First, open SQL Server Management Studio (SSMS).
   
 
2. Then, right-click the server name > click Properties.
   
 
3. After that, go to the Security page.
   
 
4. Select SQL Server and Windows Authentication mode.
   
 
5. Lastly, click OK, then restart SQL Server.
   

Method 03: Check Login Is Disabled to Resolve SQL Server Error 18456

1. In SSMS, go to Security and click Logins.
2. After that, right-click on your login and choose Properties.
3. Under the Status tab, ensure Login is enabled.
4. In the end, click OK to apply the changes.

Method 04: Map User Permissions to the Database

Even if the login is correct, the user must have access to the specific database.

1. Primarily, open SSMS and click Expand Security > Logins.
2. Then, right-click your login and click Properties.
3. Afterwards, go to User Mapping.
4. Tick the checkbox of the database you want to access.
5. Lastly, assign roles like db_datareader, db_owner, or as needed.

Troubleshoot SQL Server Error 18456 With a Professional Tool

Use a MigrateEmails SQL Database Repair Tool to fix this error when your SQL Server is severely corrupted. The tool quickly fixes corrupted or damaged SQL databases without any hassle. It repairs both MDF and NDF files with no data loss. It helps to repair complete data, including tables, triggers, queries, indices, and more. In addition, it can also preserve original formatting, structure, and metadata during the entire recovery. Along with that, it offers recovery Pending State in SQL Server Database error, and more.

Simple Steps to Recover Corrupted/Damaged SQL Database:

1. Firstly, download the MigrateEmails SQL Database Recovery Tool.
   
 
2. Now, click on Open to add a corrupted SQL database file.
   
 
3. Then, choose Recovery Modes and other options. Click OK.
   
 
4. After that, preview all the recovered SQL database files.
   
 
5. Lastly, click Save and select your desired saving format.
   

Read More: This tool helps you recover SQL data from a Dropped Table without Backups.

Conclusion

SQL Server Error 18456 can be a common problem when you are trying to log in to SQL Server. If login credentials, authentication settings, or user permissions are the issue, the manual methods above should help. If your SQL database is corrupted, fix it easily with a professional tool recommended by experts. It gives a quick recovery and allows you to regain full access to your SQL data without hassle. Moreover, a free (Demo) version of this utility is available to understand its working and features. 

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