MySQL连接器打开连接时超时

我有以下类:

public class MySqlConnectionManager
{
    public MySqlConnection Connection { get; set; }
    public void OpenConnection()
    {
        Connection = new MySqlConnection(GetConnectionString());
        try
        {
            Connection.Open();
        }
        catch (MySqlException exc)
        {
            switch (exc.Number)
            {
                case 0:
                    throw new Exception("Cannot connect to MySQL-server. Please contact administrator.");
                case 1045:
                    throw new Exception("Invalid username/password to connect to MySQL-server. Please correct data.");
                default:
                    throw new Exception("Unknown MySQL-connection error. Code: " + exc.Number);
            }
        }
    }
    private string GetConnectionString()
    {
        string activeDatabaseServer;
        string activeDatabaseName;
        string activeDatabaseUsername;
        string activeDatabasePassword;
        #if DEBUG
            activeDatabaseServer = DebugDatabaseServer;
            activeDatabaseName = DebugDatabaseName;
            activeDatabaseUsername = DebugDatabaseUsername;
            activeDatabasePassword = DebugDatabasePassword;
        #else
            activeDatabaseServer = ReleaseDatabaseServer;
            activeDatabaseName = ReleaseDatabaseName;
            activeDatabaseUsername = ReleaseDatabaseUsername;
            activeDatabasePassword = ReleaseDatabasePassword;
        #endif
        string connectionString = "server=" + activeDatabaseServer + ";uid=" + activeDatabaseUsername + ";pwd=" +
                                  activeDatabasePassword + ";database=" + activeDatabaseName + ";";
        return connectionString;
    }

当Connection.Open()被调用时，我得到一个超时异常。将超时时间设置为120秒也无济于事。我的调试数据库工作(它在本地)。我只在释放模式下得到这个异常。但我确信服务器，数据库，用户名和密码的名称是正确的，因为我使用相同的数据库从另一个应用程序编写的php在那里一切都很好。

密码包含特殊字符，如'!'， '%'， '*'， '。'或'@'。这有什么麻烦吗?