Microsoft.Data.SqlClient.SqlException - 0x80131904, 0x80131509
다음과 같이 연결 문자열을 주면,
Password=...;Integrated Security=false;User ID=...;Initial Catalog=...;Data Source=192.168.100.50;
현재의 Microsoft.Data.SqlClient에서는 이런 예외가 발생합니다.
Unhandled exception. Microsoft.Data.SqlClient.SqlException (0x80131904): A connection was successfully established with the server, but then an error occurred during the login process. (provider: SSL Provider, error: 0 - The certificate chain was issued by an authority that is not trusted.)
---> System.ComponentModel.Win32Exception (0x80090325): The certificate chain was issued by an authority that is not trusted.
at Microsoft.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
at Microsoft.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
...[생략]...
at Microsoft.Data.SqlClient.SqlConnection.Open()
at ConsoleApp1.Program.Main(String[] args) in C:\temp\ConsoleApp1\ConsoleApp1\Program.cs:line 13
윈도우 환경에서 위와 같이 오류가 발생하는데요, "The certificate chain was issued by an authority ...." 메시지를 통해 SSL 통신 문제라는 것을 알 수 있고, 아래의 문서에 따른 해결책을 따르면 됩니다.
"The certificate chain was issued by an authority that is not trusted" error after upgrading SNAC applications
; https://learn.microsoft.com/en-us/troubleshoot/sql/database-engine/connect/certificate-chain-not-trusted
가령, 3번째 방법을 택한다면 연결 문자열에 TrustServerCertificate 설정만 추가하면 됩니다.
TrustServerCertificate=true;Password=...;Integrated Security=false;User ID=...;Initial Catalog=...;Data Source=192.168.100.50
그런데, (버전 차이일지 모르겠지만) 제가 가진 Container의 리눅스 환경에서는 오류 메시지가 다음과 같이 나옵니다.
Unhandled exception. Microsoft.Data.SqlClient.SqlException (0x80131904): 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: TCP Provider, error: 40 - Could not open a connection to SQL Server: Could not open a connection to SQL Server)
그래서 얼핏 오류 메시지만 봐서는 서버로의 연결에 문제가 있다고 잘못 생각할 수 있습니다. ^^;
0x80131509 오류가 발생한다면?
System.InvalidOperationException
HResult=0x80131509
Message=An exception has been raised that is likely due to a transient failure. Consider enabling transient error resiliency by adding 'EnableRetryOnFailure' to the 'UseSqlServer' call.
Source=Microsoft.EntityFrameworkCore.SqlServer
StackTrace:
at Microsoft.EntityFrameworkCore.SqlServer.Storage.Internal.SqlServerExecutionStrategy.Execute[TState,TResult](TState state, Func`3 operation, Func`3 verifySucceeded)
at Microsoft.EntityFrameworkCore.ExecutionStrategyExtensions.Execute[TState,TResult](IExecutionStrategy strategy, TState state, Func`2 operation, Func`2 verifySucceeded)
at Microsoft.EntityFrameworkCore.SqlServer.Storage.Internal.SqlServerDatabaseCreator.Exists(Boolean retryOnNotExists)
at Microsoft.EntityFrameworkCore.SqlServer.Storage.Internal.SqlServerDatabaseCreator.Exists()
at Microsoft.EntityFrameworkCore.Storage.RelationalDatabaseCreator.EnsureCreated()
at Microsoft.EntityFrameworkCore.Infrastructure.DatabaseFacade.EnsureCreated()
at razor_80_sample.Program.Main(String[] args)
Inner Exception 1:
SqlException: 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: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)
Inner Exception 2:
Win32Exception: The specified network name is no longer available.
첫 번째 예외 메시지만 볼 것이 아니라, Inner Exception의 내용도 함께 확인하는 것이 좋습니다. 위와 같은 경우, System.InvalidOperationException 예외 메시지만으로는 오류가 뭔지 판단할 수 없지만, Inner Exception을 보면 서버로의 연결이 안 되는 것이 문제임을 인식할 수 있습니다.
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