SQL server(PC1) --- PC2: Login failed. The login is from untrusted domain and cannot be used with windows authentification

Hey,
I'want to make connection from my laptop(xxx.xxx.xxx.xxx = A) to a fixed computer(SQL server xxx.xxx.xxx.xxx =B). My connection string = "Provider=SQLNCLI11; Data source:name-pc/SQLEXPRESS; Integrated circuit=SSPI;Intial Catalog=Database name for visual
studio C#.
Laptop -> PC1 : Eror
It works when i use localhost or 127.0.0.1 and i can read my database without any problems if i install SQL server on my laptop. Know i install it to PC1 and uninstall on my laptop. When i change the name-pc by an ip-adress i get this error: Login failed.
The login is from untrusted domain and cannot be used with windows authentification. I did some research on multiple forums where they say about Local security policy(secpol.exe) but i don't have this file.
PC2-> PC3: work fine but i want to work with my laptop and i don't understand why it isn't working with my Laptop.
Can someone help me?
Thx a lot and sry about my english(its a disaster)
Thibaut

Hello,
Yes, for the Windows Authentication to work you should be using the same Windows account and password.
Are you willing to create SQL logins inside SQL Server and allow your users to connect to SQL Server using SQL Authentication
instead of Windows Authentication? That could be a solution on a workgroup network.
Hope this helps.
Regards,
Alberto Morillo
SQLCoffee.com

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