Web Reference: Before you start troubleshooting, we recommend that you check the prerequisites and go through the checklist. This article helps troubleshoot network connectivity errors in SQL Server. These errors are consistent and repeatable every time. I'm writing a windows service that needs to connect to a SQL server to retrieve some information. However, the server doesn't allow me to connect: login failed for user [domain/username]. Jul 23, 2025 · Troubleshoot common SQL Server connectivity errors with this comprehensive guide. Learn how to fix network and instance-specific issues.
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Last Updated: May 18, 2026
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