![SQL SERVER - Fix : Error: 4064 - Cannot open user default database. Login failed. Login failed for user - SQL Authority with Pinal Dave SQL SERVER - Fix : Error: 4064 - Cannot open user default database. Login failed. Login failed for user - SQL Authority with Pinal Dave](https://blog.sqlauthority.com/i/b/error4064_1.jpg)
SQL SERVER - Fix : Error: 4064 - Cannot open user default database. Login failed. Login failed for user - SQL Authority with Pinal Dave
![Microsoft.Data.SqlClient.SqlException (0x80131904): Login failed for user ''. · Issue #61632 · MicrosoftDocs/azure-docs · GitHub Microsoft.Data.SqlClient.SqlException (0x80131904): Login failed for user ''. · Issue #61632 · MicrosoftDocs/azure-docs · GitHub](https://user-images.githubusercontent.com/11407921/91443771-6fb11680-e891-11ea-847a-3c8fec7b8198.png)
Microsoft.Data.SqlClient.SqlException (0x80131904): Login failed for user ''. · Issue #61632 · MicrosoftDocs/azure-docs · GitHub
![Solving error: System.Data.SqlClient.SqlException: Login failed for user 'IIS APPPOOLDefaultAppPool' in IIS 7 | Chanmingman's Blog Solving error: System.Data.SqlClient.SqlException: Login failed for user 'IIS APPPOOLDefaultAppPool' in IIS 7 | Chanmingman's Blog](https://chanmingman.files.wordpress.com/2009/10/apppool_thumb5b35d.jpg?w=380&h=186)
Solving error: System.Data.SqlClient.SqlException: Login failed for user 'IIS APPPOOLDefaultAppPool' in IIS 7 | Chanmingman's Blog
Microsoft.Data.SqlClient.SqlException (0x80131904): Login failed for user ''. · Issue #61632 · MicrosoftDocs/azure-docs · GitHub
![Login failed for user iis apppool default apppool System.Data.Sqlclient. Sqlexception - .Net Core | MVC | HTML Agility Pack | SQL | Technology Crowds Login failed for user iis apppool default apppool System.Data.Sqlclient. Sqlexception - .Net Core | MVC | HTML Agility Pack | SQL | Technology Crowds](https://3.bp.blogspot.com/-PMjuPW41-SQ/UThvSJyYsUI/AAAAAAAAAD4/9JlCj8MwOnk/s640/Default_Application_Pool.png)
Login failed for user iis apppool default apppool System.Data.Sqlclient. Sqlexception - .Net Core | MVC | HTML Agility Pack | SQL | Technology Crowds
![BizTalk WCF-SQL Error: Microsoft.ServiceModel.Channels.Common.ConnectionException: Login failed for user - BizTalkGurus BizTalk WCF-SQL Error: Microsoft.ServiceModel.Channels.Common.ConnectionException: Login failed for user - BizTalkGurus](https://www.biztalkgurus.com/wp-content/uploads/2018/10/01-WCF-SQL-Receive-Location-Login-Failed-For-user_thumb-1.png)
BizTalk WCF-SQL Error: Microsoft.ServiceModel.Channels.Common.ConnectionException: Login failed for user - BizTalkGurus
![sql server - System.Data.SqlClient.SqlException (0x80131904): Login failed for user - Stack Overflow sql server - System.Data.SqlClient.SqlException (0x80131904): Login failed for user - Stack Overflow](https://i.stack.imgur.com/ev5Zl.jpg)
sql server - System.Data.SqlClient.SqlException (0x80131904): Login failed for user - Stack Overflow
Cannot open database requested by the login. The login failed. Login failed for user 'NT AUTHORITY\NETWORK SERVICE'. - ASP.NET,C# .NET,VB.NET,JQuery,JavaScript,Gridview
![System.Data.SqlClient.SqlException: Cannot open database "Northwind" requested by the login. The login failed. Login failed for user 'IIS APPPOOL\DefaultAppPool'. System.Data.SqlClient.SqlException: Cannot open database "Northwind" requested by the login. The login failed. Login failed for user 'IIS APPPOOL\DefaultAppPool'.](https://1.bp.blogspot.com/-blqifyYVC4M/T9xPIKu7uOI/AAAAAAAABO0/h_vDwTR1mqk/s1600/image1.png)
System.Data.SqlClient.SqlException: Cannot open database "Northwind" requested by the login. The login failed. Login failed for user 'IIS APPPOOL\DefaultAppPool'.
![Error message when you try to log on to Microsoft Dynamics CRM 4.0: “Cannot open database '[Organization]_MSCRM' requested by the login” | General Concepts - Tricks & Tips & MicroSoft Dynamics CRM Error message when you try to log on to Microsoft Dynamics CRM 4.0: “Cannot open database '[Organization]_MSCRM' requested by the login” | General Concepts - Tricks & Tips & MicroSoft Dynamics CRM](https://mscrm4humans.files.wordpress.com/2010/04/application-error.jpg)
Error message when you try to log on to Microsoft Dynamics CRM 4.0: “Cannot open database '[Organization]_MSCRM' requested by the login” | General Concepts - Tricks & Tips & MicroSoft Dynamics CRM
![System.Data.SqlClient.SqlException: Login failed for user 'IIS APPPOOL\DefaultAppPool' in IIS7 - ASP.NET,C# .NET,VB.NET,JQuery,JavaScript,Gridview System.Data.SqlClient.SqlException: Login failed for user 'IIS APPPOOL\DefaultAppPool' in IIS7 - ASP.NET,C# .NET,VB.NET,JQuery,JavaScript,Gridview](https://3.bp.blogspot.com/-Nl1ONPU5zyw/TdacsCrS6pI/AAAAAAAAAic/IJS4IG6Lztg/s1600/Advanced+Settings.jpg)
System.Data.SqlClient.SqlException: Login failed for user 'IIS APPPOOL\DefaultAppPool' in IIS7 - ASP.NET,C# .NET,VB.NET,JQuery,JavaScript,Gridview
![SQL SERVER - FIX : ERROR : Cannot open database requested by the login. The login failed. Login failed SQL SERVER - FIX : ERROR : Cannot open database requested by the login. The login failed. Login failed](https://blog.sqlauthority.com/i/b/errnt1.jpg)
SQL SERVER - FIX : ERROR : Cannot open database requested by the login. The login failed. Login failed
![System.Data.SqlClient.SqlException: Login failed for user 'IIS APPPOOL\DefaultAppPool' in IIS7 - ASP.NET,C# .NET,VB.NET,JQuery,JavaScript,Gridview System.Data.SqlClient.SqlException: Login failed for user 'IIS APPPOOL\DefaultAppPool' in IIS7 - ASP.NET,C# .NET,VB.NET,JQuery,JavaScript,Gridview](https://4.bp.blogspot.com/-dEo_1omOZxI/TdaciIotWwI/AAAAAAAAAiY/VrElCA2EhHE/s1600/Applicationfool.png)
System.Data.SqlClient.SqlException: Login failed for user 'IIS APPPOOL\DefaultAppPool' in IIS7 - ASP.NET,C# .NET,VB.NET,JQuery,JavaScript,Gridview
![System.Data.SqlClient.SqlException: Login failed for user 'IIS APPPOOL\DefaultAppPool' in IIS7 - ASP.NET,C# .NET,VB.NET,JQuery,JavaScript,Gridview System.Data.SqlClient.SqlException: Login failed for user 'IIS APPPOOL\DefaultAppPool' in IIS7 - ASP.NET,C# .NET,VB.NET,JQuery,JavaScript,Gridview](https://2.bp.blogspot.com/-xJ7o6TQWRY8/Tdac1stknFI/AAAAAAAAAig/T_9Ddex2Pn8/s1600/LocalSystem.jpg)
System.Data.SqlClient.SqlException: Login failed for user 'IIS APPPOOL\DefaultAppPool' in IIS7 - ASP.NET,C# .NET,VB.NET,JQuery,JavaScript,Gridview
![sql server - System.Data.SqlClient.SqlException (0x80131904): Login failed for user - Stack Overflow sql server - System.Data.SqlClient.SqlException (0x80131904): Login failed for user - Stack Overflow](https://i.stack.imgur.com/KIHzU.jpg)