What went wrong
A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 25 - Connection string is not valid)
How to fix it
The database server could not be reached. Check Server= in appsettings.json against the host shown in Plesk → Databases.
Settings in appsettings.json
| Database type | SqlServer |
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| Server | 103.21.58.193:0 |
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| Database | ibsleqbq_billindu |
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| User Id | Billing |
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| Password | set (9 characters) |
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After you save appsettings.json, just reload this page – the application re-reads the file and tries again. Checked 21-10-2026 03:38:00 (server time).
Try again