尝试连接到另一台计算机上存储的数据库时出现“等待操作超时”错误

Question

I'm working on an EF Core project that uses a SQL Server database, which I created on my laptop, and want to access it from my desktop. I'm not accessing it with my code yet - I'd just like to manually connect to it, and be able to see the DB in SQL Server Object Explorer for now (to verify that my desktop is connected to it before running my program).

To connect, I enabled TCP/IP in Configuration Manager on my laptop and added a new rule for the firewall to allow the connection. Then, when I type my laptop's name into SSMS on my desktop, after about 30 seconds, it throws the 'wait operation timed out' error.

Here is the stack trace:

at System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, SqlCredential credential, Object providerInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString userConnectionOptions, SessionData reconnectSessionData, DbConnectionPool pool, String accessToken, Boolean applyTransientFaultHandling, SqlAuthenticationProviderManager sqlAuthProviderManager) at System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, DbConnectionPoolKey poolKey, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection, DbConnectionOptions userOptions) at System.Data.ProviderBase.DbConnectionFactory.CreateNonPooledConnection(DbConnection owningConnection, DbConnectionPoolGroup poolGroup, DbConnectionOptions userOptions) at Sys tem.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource 1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection) at System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource 1 retry, DbConnectionOptions userOptions) at System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource 1 retry, DbConnectionOptions userOptions) at System.Data.SqlClient.SqlConnection.TryOpenInner(TaskCompletionSource 1 retry) at System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry) at System.Data.SqlClient.SqlConnection.Open() at Microsoft.SqlServer.Management.SqlStudio.Explorer.ObjectExplorerService.ValidateConnection(UIConnectionInfo ci, IServerType server) at Microsoft.SqlServer.Management .UI.ConnectionDlg.Connector.ConnectionThreadUser()

I have very little experience with connecting computers across networks, and only just learned how to create a firewall rule, so my guesses for what the problem could be are limited. Maybe there's a simpler way to access the database? Probably not, from what I've seen, but if there is I'd be happy to know!

Thanks in advance for any help you can offer.

Answer 1

This is a piece of real code. I think it will be useful for your case.

public async Task<bool> CheckMsSqlConnection(string connectionString, int timeout = 8000)
{
    try
    {
        var dc = new MyDbContext(connectionString);
        var ctx = new CancellationTokenSource();
        ctx.CancelAfter(TimeSpan.FromMilliseconds(timeout));

        var db = dc.Database;
        db.CommandTimeout = 1;

        await db.Connection.OpenAsync(ctx.Token);

        return true;
    }
    catch (Exception ex)
    {
        return false;
    }
}