diff --git a/src/Ether.Network/Client/NetClient.cs b/src/Ether.Network/Client/NetClient.cs
index cf25db5..97f8bce 100644
--- a/src/Ether.Network/Client/NetClient.cs
+++ b/src/Ether.Network/Client/NetClient.cs
@@ -9,6 +9,7 @@
 using System.Net.Sockets;
 using System.Threading;
 using System.Threading.Tasks;
+using Ether.Network.Exceptions;
 
 namespace Ether.Network.Client
 {
@@ -73,6 +74,8 @@ public void Connect()
             if (this.IsConnected)
                 throw new InvalidOperationException("Client is already connected to remote.");
 
+            this.CheckConfiguration();
+
             this.Socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
             this._socketSendArgs = NetUtils.CreateSocketAsync(this.Socket, this.IO_Completed);
             this._socketReceiveArgs = NetUtils.CreateSocketAsync(this, this.IO_Completed, this.Configuration.BufferSize);
@@ -238,6 +241,21 @@ private void ProcessReceive(SocketAsyncEventArgs e)
             }
         }
 
+        /// <summary>
+        /// Checks the configuration.
+        /// </summary>
+        private void CheckConfiguration()
+        {
+            if (this.Configuration.Port <= 0)
+                throw new EtherConfigurationException($"{this.Configuration.Port} is not a valid port.");
+            
+            if (this.Configuration.Address == null)
+                throw new EtherConfigurationException($"Invalid host : {this.Configuration.Host}.");
+
+            if (this.Configuration.BufferSize <= 0)
+                throw new EtherConfigurationException("BufferSize cannot less or equal to 0.");
+        }
+
         /// <summary>
         /// Triggered when a <see cref="SocketAsyncEventArgs"/> async operation is completed.
         /// </summary>
diff --git a/src/Ether.Network/Server/NetServer.cs b/src/Ether.Network/Server/NetServer.cs
index ff2adcf..92259b2 100644
--- a/src/Ether.Network/Server/NetServer.cs
+++ b/src/Ether.Network/Server/NetServer.cs
@@ -74,12 +74,7 @@ public void Start()
             if (this.IsRunning)
                 throw new InvalidOperationException("Server is already running.");
 
-            if (this.Configuration.Port <= 0)
-                throw new EtherConfigurationException($"{this.Configuration.Port} is not a valid port.");
-
-            IPAddress address = this.Configuration.Host == AllInterfaces ? IPAddress.Any : this.Configuration.Address;
-            if (address == null)
-                throw new EtherConfigurationException($"Invalid host : {this.Configuration.Host}");
+            this.CheckConfiguration();
 
             for (var i = 0; i < this.Configuration.MaximumNumberOfConnections; i++)
             {
@@ -90,7 +85,7 @@ public void Start()
             this.Initialize();
             this.Socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
             this.Socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, 1);
-            this.Socket.Bind(new IPEndPoint(address, this.Configuration.Port));
+            this.Socket.Bind(NetUtils.CreateIpEndPoint(this.Configuration.Host, this.Configuration.Port));
             this.Socket.Listen(this.Configuration.Backlog);
             this.IsRunning = true;
             this.StartAccept(NetUtils.CreateSocketAsync(null, this.IO_Completed));
@@ -358,6 +353,25 @@ private void ClearResources()
             this._messageQueue.Clear();
         }
 
+        /// <summary>
+        /// Checks the configuration.
+        /// </summary>
+        private void CheckConfiguration()
+        {
+            if (this.Configuration.Port <= 0)
+                throw new EtherConfigurationException($"{this.Configuration.Port} is not a valid port.");
+
+            IPAddress address = this.Configuration.Host == AllInterfaces ? IPAddress.Any : this.Configuration.Address;
+            if (address == null)
+                throw new EtherConfigurationException($"Invalid host : {this.Configuration.Host}.");
+
+            if (this.Configuration.BufferSize <= 0)
+                throw new EtherConfigurationException("BufferSize cannot less or equal to 0.");
+
+            if (this.Configuration.Backlog <= 0)
+                throw new EtherConfigurationException("Backlog cannot be less or equal to 0.");
+        }
+
         /// <summary>
         /// Triggered when a <see cref="SocketAsyncEventArgs"/> async operation is completed.
         /// </summary>
diff --git a/test/Ether.Network.Tests/Contexts/NetConfig/ConfigClient.cs b/test/Ether.Network.Tests/Contexts/NetConfig/ConfigClient.cs
new file mode 100644
index 0000000..62dfaee
--- /dev/null
+++ b/test/Ether.Network.Tests/Contexts/NetConfig/ConfigClient.cs
@@ -0,0 +1,27 @@
+using System.Net.Sockets;
+using Ether.Network.Client;
+
+namespace Ether.Network.Tests.Contexts.NetConfig
+{
+    public class ConfigClient : NetClient
+    {
+        protected override void OnConnected()
+        {
+        }
+
+        protected override void OnDisconnected()
+        {
+        }
+
+        protected override void OnSocketError(SocketError socketError)
+        {
+        }
+
+        public void SetupConfiguration()
+        {
+            this.Configuration.Host = "127.0.0.1";
+            this.Configuration.Port = 4445;
+            this.Configuration.BufferSize = 512;
+        }
+    }
+}
diff --git a/test/Ether.Network.Tests/Contexts/NetConfig/ConfigServer.cs b/test/Ether.Network.Tests/Contexts/NetConfig/ConfigServer.cs
index dab52ea..e7e929a 100644
--- a/test/Ether.Network.Tests/Contexts/NetConfig/ConfigServer.cs
+++ b/test/Ether.Network.Tests/Contexts/NetConfig/ConfigServer.cs
@@ -1,6 +1,4 @@
 using System;
-using System.Collections.Generic;
-using System.Text;
 using Ether.Network.Common;
 using Ether.Network.Server;
 
diff --git a/test/Ether.Network.Tests/NetClientConfigurationTest.cs b/test/Ether.Network.Tests/NetClientConfigurationTest.cs
new file mode 100644
index 0000000..63e3374
--- /dev/null
+++ b/test/Ether.Network.Tests/NetClientConfigurationTest.cs
@@ -0,0 +1,66 @@
+using System;
+using Ether.Network.Exceptions;
+using Ether.Network.Tests.Contexts.NetConfig;
+using Xunit;
+
+namespace Ether.Network.Tests
+{
+    public class NetClientConfigurationTest
+    {
+        [Fact]
+        public void StartClientWihtoutConfiguration()
+        {
+            using (var server = new ConfigServer())
+            {
+                server.SetupConfiguration();
+                server.Start();
+
+                using (var client = new ConfigClient())
+                {
+                    Exception ex = Assert.Throws<EtherConfigurationException>(() => client.Connect());
+                    Assert.IsType<EtherConfigurationException>(ex);
+
+                    client.Disconnect();
+                }
+            }
+        }
+
+        [Fact]
+        public void StartClientWithConfiguration()
+        {
+            using (var server = new ConfigServer())
+            {
+                server.SetupConfiguration();
+                server.Start();
+
+                using (var client = new ConfigClient())
+                {
+                    client.SetupConfiguration();
+                    client.Connect();
+                    client.Disconnect();
+                }
+            }
+        }
+
+        [Fact]
+        public void SetupClientConfigurationAfterConnected()
+        {
+            using (var server = new ConfigServer())
+            {
+                server.SetupConfiguration();
+                server.Start();
+
+                using (var client = new ConfigClient())
+                {
+                    client.SetupConfiguration();
+                    client.Connect();
+
+                    Exception ex = Assert.Throws<EtherConfigurationException>(() => client.SetupConfiguration());
+                    Assert.IsType<EtherConfigurationException>(ex);
+
+                    client.Disconnect();
+                }
+            }
+        }
+    }
+}
\ No newline at end of file