Encountering ‘Login failed for user “domain\Username”’ during data retrieval with integrated security. Mixed authentication is enabled. Code snippet:
<connectionDetails key="DBAccess" value="Server=YourServer;Initial Catalog=YourDB;Trusted_Connection=True" />
Need assistance.
hey, try swapping trusted_connection=true with integrated security=sspi in your string, i had a simmilar hiccup. also, check if your spn is regestered correcly - sometimes its the tiniest detail in the connnection string.
hey, did you ever try resetting the sql server service? i had a case where a small ad delay messed up the connection. got any ideas on how others fixed it after domain changes?
Based on personal experience, this error often results from permission issues related to the Windows account running the application. Confirm that the account is properly granted access in SQL Server and that Active Directory synchronization is in order. Additionally, I have found that ensuring the account is included as a valid login and verifying its role membership usually resolves this error. It may also be beneficial to test with SQL authentication to isolate whether the issue is specific to integrated security or a broader permission misconfiguration.
In my experience, this error can also be addressed by verifying that device-level authentication settings on the client side are not interfering with the connection. Occasionally, local machine configurations or recently applied group policies can prevent proper delegation of integrated security credentials. It is beneficial to review the service account privileges on the SQL Server to confirm that the application’s machine account has appropriate rights. Rechecking these configurations can help identify if changes in network security or domain policies are causing the login failure.
hey, i ran into this too - turn out an outdated driver in our ad caused it, restarting the sql service after updating fixed it. you might also try using sql auth to see if its specifically windows integration trippin. hope it helps!