Open connection issue on Linux

I’m using Microsoft.Data.SqlClient 1.0.19128.1-preview on Linux RHEL 6 to connect to SQLServer running on Windows. This is my connection string: string connetionString Server=“SomeComputer\SQLIntegTest,61245;Database=db4;uid=user;pwd=password;Trusted_Connection=No”

with this code:

SqlConnection cnn = new SqlConnection(connetionString); cnn.Open()

I get the following error. The same code works on windows. Any help would be appreciated.

Unhandled Exception: Microsoft.Data.SqlClient.SqlException: Connection Timeout Expired. The timeout period elapsed during the post-login phase. The connection could have timed out while waiting for server to complete the login process and respond; Or it could have timed out while attempting to create multiple active connections. The duration spent while attempting to connect to this server was - [Pre-Login] initialization=118; handshake=271; [Login] initialization=11; authentication=14; [Post-Login] complete=14041; —> System.ComponentModel.Win32Exception: Unknown error 258 — End of inner exception stack trace — at Microsoft.Data.SqlClient.SqlInternalConnectionTds…ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, SqlCredential credential, Object providerInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString userConnectionOptions, SessionData reconnectSessionData, Boolean applyTransientFaultHandling, String accessToken) at Microsoft.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, DbConnectionPoolKey poolKey, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection, DbConnectionOptions userOptions) at Microsoft.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnectionPool pool, DbConnection owningObject, DbConnectionOptions options, DbConnectionPoolKey poolKey, DbConnectionOptions userOptions) at Microsoft.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection) at Microsoft.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection) at Microsoft.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal& connection) at Microsoft.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, TaskCompletionSource1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection) at Microsoft.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection) at Microsoft.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource1 retry, DbConnectionOptions userOptions) at Microsoft.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource1 retry) at Microsoft.Data.SqlClient.SqlConnection.Open() Abort (core dumped)

[iarovyi]

Thanks. It worked for me by adding single line in dockerfile because with dockerfile there is no need for explicit reboot:

RUN sed -i '/^ssl_conf = ssl_sect$/s/^/#/' /etc/ssl/openssl.cnf

Example dockerfile:

FROM mcr.microsoft.com/dotnet/core/aspnet:3.1 AS base

WORKDIR /app
EXPOSE 80

FROM mcr.microsoft.com/dotnet/core/sdk:3.1 AS build
WORKDIR /src
COPY ["MyApp/MyApp.csproj", "MyApp/"]
RUN dotnet restore "MyApp/MyApp.csproj"
COPY . .
WORKDIR "/src/MyApp"
RUN dotnet build "MyApp.csproj" -c Release -o /app/build

FROM build AS publish
RUN dotnet publish "MyApp.csproj" -c Release -o /app/publish

FROM base AS final
RUN sed -i '/^ssl_conf = ssl_sect$/s/^/#/' /etc/ssl/openssl.cnf
WORKDIR /app
COPY --from=publish /app/publish .
ENTRYPOINT ["dotnet", "eVision.MyApp.dll"]

[saravananpalanivel]

I’m facing same issue - i.e. my dotnet core 3 preview8 application is running in Kubernetes cluster (on premise Linux container) which is trying to access remote MSSQL Server 2014 - but hung at connection.Open(). But same works with MSSQL Server 2016.

Connection string : “Data Source=10.150.109.140,1433;Initial Catalog=ReportServer;Connect Timeout=60;User ID=username;Password=password; Persist Security Info=False;Packet Size=4096”

Docker images used : mcr.microsoft.com/dotnet/core/sdk:3.0.100-preview8 & mcr.microsoft.com/dotnet/core/aspnet:3.0.0-preview8