Throw MySqlException for invalid port number.

Author: bgrainger

src/MySqlConnector/Core/ServerSession.cs

@@ -301,6 +301,12 @@ public async Task ConnectAsync(ConnectionSettings cs, ILoadBalancer loadBalancer
 				if (ShouldGetRealServerDetails())
 					await GetRealServerDetailsAsync(ioBehavior, CancellationToken.None).ConfigureAwait(false);
 			}
+			catch (ArgumentException ex)
+			{
+				m_logArguments[1] = ex.Message;
+				Log.Error("{0} couldn't connect to server: {1}", m_logArguments);
+				throw new MySqlException("Couldn't connect to server", ex);
+			}
 			catch (IOException ex)
 			{
 				m_logArguments[1] = ex.Message;

tests/SideBySide/ConnectSync.cs

@@ -45,6 +45,20 @@ public void ConnectBadPort()
 			}
 		}
 
+		[Fact]
+		public void ConnectInvalidPort()
+		{
+			var csb = new MySqlConnectionStringBuilder
+			{
+				Server = "localhost",
+				Port = 1000000,
+			};
+			using (var connection = new MySqlConnection(csb.ConnectionString))
+			{
+				Assert.Throws<MySqlException>(() => connection.Open());
+			}
+		}
+
 		[Fact]
 		public void ConnectBadDatabase()
 		{