Time Out Expired

Can anyone see a reason that the application keeps timing out, it was work fine a couple of days ago.

private DataTable Search6HostPlaces(string host)
    {
        DataTable dt;
        host = lblHostname.Text;

        SqlConnection cn = new SqlConnection(ConfigurationManager.AppSettings["ConnectionString"]);
        SqlCommand cmd = new SqlCommand("matchHost", cn);
        cmd.CommandType = CommandType.StoredProcedure;
        cmd.Parameters.AddWithValue("@pHost", host);

        SqlDataAdapter sda = new SqlDataAdapter();
        sda.SelectCommand = cmd;

        DataSet ds = new DataSet();
        cn.Open(); <--------------------------------------------------------Timeout when is gets here

        sda.Fill(ds, "HostName");
        dt = ds.Tables["HostName"];

        cn.Close();

        //dt.Rows.Count.ToString();

        return dt;
    }

    public void CountRecords()
    {

        DataTable dt = Search6HostPlaces("host");

        lblTest.Text = dt.Rows.Count.ToString();
    }