How to configure socket connect timeout

Question

When the Client tries to connect to a disconnected IP address  there is a long timeout over 15 seconds    How can we reduce this timeout  What is the method to configure it   The code I m using to set up a socket connection is as following    try       m clientSocket   new Socket           AddressFamily InterNetwork           SocketType Stream           ProtocolType Tcp        IPAddress ip   IPAddress Parse serverIp       int iPortNo   System Convert ToInt16 serverPort       IPEndPoint ipEnd   new IPEndPoint ip  iPortNo        m clientSocket Connect ipEnd       if  m clientSocket Connected                lb connectStatus Text    Connection Established           WaitForServerData            catch  SocketException se        lb connectStatus Text    Connection Failed       MessageBox Show se Message

User · Answer

it might be too late but there is neat solution based on Task WaitAny  c  5        public static bool ConnectWithTimeout this Socket socket  string host  int port  int timeout                        bool connected   false              Task result   socket ConnectAsync host  port                              int index   Task WaitAny new     result    timeout               connected   socket Connected              if   connected                  socket Close                               return connected

User · Answer

My take   public static class SocketExtensions            lt summary gt          Connects the specified socket           lt  summary gt           lt param name  socket  gt The socket  lt  param gt           lt param name  endpoint  gt The IP endpoint  lt  param gt           lt param name  timeout  gt The timeout  lt  param gt      public static void Connect this Socket socket  EndPoint endpoint  TimeSpan timeout                var result   socket BeginConnect endpoint  null  null            bool success   result AsyncWaitHandle WaitOne timeout  true           if  success                        socket EndConnect result                     else                       socket Close                throw new SocketException 10060      Connection timed out

User · Answer

Check this out on MSDN   It does not appear that you can do this with the implemented properties in the Socket class     The poster on MSDN actually solved his problem using threading   He had a main thread which called out to other threads which run the connection code for a couple seconds and then check the Connected property of the socket      I created another method wich actually   connected the socket     had the main   thread sleep for 2 seconds and then   check on the connecting method  wich   is run in a separate thread   if the   socket was connected good otherwise   throw an exception  Timed out   and   that s all  Thanks again for the   repleies    What are you trying to do  and why can t it wait for 15-30 seconds before timing out

User · Answer

I found this  Simpler than the accepted answer  and works with  NET v2  Socket socket   new Socket AddressFamily InterNetwork  SocketType Stream  ProtocolType Tcp       Connect using a timeout  5 seconds   IAsyncResult result   socket BeginConnect  sIP  iPort  null  null     bool success   result AsyncWaitHandle WaitOne  5000  true     if   socket Connected         socket EndConnect  result      else            NOTE  MUST CLOSE THE SOCKET       socket Close         throw new ApplicationException  Failed to connect server

User · Answer

I worked with Unity and had some problem with the BeginConnect and other async methods from socket   There is something than I don t understand but the code samples before doesn t work for me    So I wrote this piece of code to make it work  I test it on an adhoc network with android and pc  also in local on my computer  Hope it can help   using System Net Sockets  using System Threading  using System Net  using System  using System Diagnostics   class ConnexionParameter   Guardian       public TcpClient client      public string address      public int port      public Thread principale      public Thread thisthread   null      public int timeout       private EventWaitHandle wh   new AutoResetEvent false        public ConnexionParameter TcpClient client  string address  int port  int timeout  Thread principale                this client   client          this address   address          this port   port          this principale   principale          this timeout   timeout          thisthread   new Thread Connect               public void Connect                 WatchDog Start timeout  this           try                       client Connect IPAddress Parse address   port                      catch  Exception                        UnityEngine Debug LogWarning  Unable to connect service  Training mode  Or not running                        OnTimeOver              principale Resume               public bool IsConnected   true      public void OnTimeOver                 try                       if   client Connected                                      there is the trick  The abort method from thread doesn t  make the connection stop immediately I think it s because it rise an exception  that make time to stop   Instead I close the socket while it s trying to  connect   that make the connection method return faster                   IsConnected   false                   client Close                              wh Set                       catch Exception                        UnityEngine Debug LogWarning  Connexion already closed  or forcing connexion thread to end  Ignore                           public void Start                  thisthread Start            wh WaitOne              principale Suspend               public bool Get                 Start            return IsConnected            public static class Connexion         public static bool Connect this TcpClient client  string address  int port  int timeout                ConnexionParameter cp   new ConnexionParameter client  address  port  timeout  Thread CurrentThread           return cp Get             http   stackoverflow com questions 19653588 timeout-at-acceptsocket     public static Socket AcceptSocket this TcpListener tcpListener  int timeoutms  int pollInterval   10                TimeSpan timeout   TimeSpan FromMilliseconds timeoutms           var stopWatch   new Stopwatch            stopWatch Start            while  stopWatch Elapsed  lt  timeout                        if  tcpListener Pending                    return tcpListener AcceptSocket                 Thread Sleep pollInterval                     return null              and there a very simple watchdog on C  to make it work   using System Threading   public interface Guardian       void OnTimeOver       public class WatchDog        int m iMs      Guardian m guardian       public WatchDog int a iMs  Guardian a guardian                m iMs   a iMs          m guardian   a guardian          Thread thread   new Thread body           thread Start this               private void body object o                WatchDog watchdog    WatchDog o          Thread Sleep watchdog m iMs           watchdog m guardian OnTimeOver               public static void Start int a iMs  Guardian a guardian                new WatchDog a iMs  a guardian

User · Answer

I dont program in C  but in C  we solve the same problem by making the socket non-blocking and then putting the fd in a select poll loop with a timeout value equal to the amount of time we are willing to wait for the connect to succeed    I found this for Visual C   and the explanation there also bends towards the select poll mechanism I explained before   In my experience  you cannot change connect timeout values per socket  You change it for all  by tuning OS parameters

User · Answer

There should be a ReceiveTimeout property in the Socket class   Socket ReceiveTimeout Property

User · Answer

I had the Same problem when connecting to a Socket and I came up with the below solution  It works Fine for me     private bool CheckConnectivityForProxyHost string hostName  int port                      if  string IsNullOrEmpty hostName                  return false              bool isUp   false             Socket testSocket   null              try                              testSocket   new Socket AddressFamily InterNetwork  SocketType Stream  ProtocolType Tcp                  IPAddress ip   null                 if  testSocket    null  amp  amp  NetworkingCollaboratorBase GetResolvedConnecionIPAddress hostName  out ip    Use a method to resolve your IP                                     IPEndPoint ipEndPoint   new IPEndPoint ip  port                       isUp   false    time out 5 Sec                   CallWithTimeout ConnectToProxyServers  5000  testSocket  ipEndPoint                           if  testSocket    null  amp  amp  testSocket Connected                                                      isUp   true                                                                                          catch  Exception ex                              isUp   false                          finally                             try                                     if  testSocket    null                                              testSocket Shutdown SocketShutdown Both                                                        catch  Exception ex                                                    finally                                     if  testSocket    null                         testSocket Close                                               return isUp              private void CallWithTimeout Action lt Socket  IPEndPoint gt  action  int timeoutMilliseconds  Socket socket  IPEndPoint ipendPoint                      try                             Action wrappedAction        gt                                      action socket  ipendPoint                                     IAsyncResult result   wrappedAction BeginInvoke null  null                   if  result AsyncWaitHandle WaitOne timeoutMilliseconds                                       wrappedAction EndInvoke result                                             catch  Exception ex                                         private void ConnectToProxyServers Socket testSocket  IPEndPoint ipEndPoint                      try                             if  testSocket    null    ipEndPoint    null                     return                      testSocket Connect ipEndPoint                            catch  Exception ex

User · Answer

I solved the problem by using Socket ConnectAsync Method instead of Socket Connect Method  After invoking the Socket ConnectAsync SocketAsyncEventArgs   start a timer  timer connection   if time is up  check whether socket connection is connected  if m clientSocket Connected    if not  pop up timeout error     private void connect string ipAdd string port                try                       SocketAsyncEventArgs e new SocketAsyncEventArgs                  m clientSocket   new Socket AddressFamily InterNetwork  SocketType Stream  ProtocolType Tcp                IPAddress ip   IPAddress Parse serverIp               int iPortNo   System Convert ToInt16 serverPort               IPEndPoint ipEnd   new IPEndPoint ip  iPortNo                  m clientSocket              e RemoteEndPoint   ipEnd              e UserToken   m clientSocket              e Completed  new EventHandler lt SocketAsyncEventArgs gt  e Completed                               m clientSocket ConnectAsync e                if  timer connection    null                                timer connection Dispose                              else                               timer connection   new Timer                              timer connection Interval   2000              timer connection Tick  new EventHandler timer connection Tick               timer connection Start                      catch  SocketException se                        lb connectStatus Text    Connection Failed               MessageBox Show se Message                   private void e Completed object sender SocketAsyncEventArgs e                lb connectStatus Text    Connection Established           WaitForServerData              private void timer connection Tick object sender  EventArgs e                if   m clientSocket Connected                        MessageBox Show  Connection Timeout                  m clientSocket   null               timer connection Stop

User · Answer

I just wrote an extension class in order to allow timeouts in connections  Use it exactly as you would use the standard Connect   methods  with an extra parameter named timeout   using System  using System Net  using System Net Sockets        lt summary gt      Extensions to Socket class      lt  summary gt  public static class SocketExtensions            lt summary gt          Connects the specified socket           lt  summary gt           lt param name  socket  gt The socket  lt  param gt           lt param name  host  gt The host  lt  param gt           lt param name  port  gt The port  lt  param gt           lt param name  timeout  gt The timeout  lt  param gt      public static void Connect this Socket socket  string host  int port  TimeSpan timeout                AsyncConnect socket   s  a  o    gt  s BeginConnect host  port  a  o   timeout                   lt summary gt          Connects the specified socket           lt  summary gt           lt param name  socket  gt The socket  lt  param gt           lt param name  addresses  gt The addresses  lt  param gt           lt param name  port  gt The port  lt  param gt           lt param name  timeout  gt The timeout  lt  param gt      public static void Connect this Socket socket  IPAddress   addresses  int port  TimeSpan timeout                AsyncConnect socket   s  a  o    gt  s BeginConnect addresses  port  a  o   timeout                   lt summary gt          Asyncs the connect           lt  summary gt           lt param name  socket  gt The socket  lt  param gt           lt param name  connect  gt The connect  lt  param gt           lt param name  timeout  gt The timeout  lt  param gt      private static void AsyncConnect Socket socket  Func lt Socket  AsyncCallback  object  IAsyncResult gt  connect  TimeSpan timeout                var asyncResult   connect socket  null  null           if   asyncResult AsyncWaitHandle WaitOne timeout                         try                               socket EndConnect asyncResult                             catch  SocketException                              catch  ObjectDisposedException

User · Answer

This is like FlappySock s answer  but I added a callback to it because I didn t like the layout and how the Boolean was getting returned   In the comments of that answer from Nick Miller    In my experience  if the end point can be reached  but there is no server on the endpoint able to receive the connection  then AsyncWaitHandle WaitOne will be signaled  but the socket will remain unconnected  So to me  it seems relying on what is returned can be dangerous - I prefer to use socket Connected   I set a nullable Boolean and update it in the callback function   I also found it doesn t always finish reporting the result before returning to the main function - I handle for that  too  and make it wait for the result using the timeout    private static bool  areWeConnected   null   private static bool checkSocket string svrAddress  int port        IPEndPoint endPoint   new IPEndPoint IPAddress Parse svrAddress   port       Socket socket   new Socket endPoint AddressFamily  SocketType Stream  ProtocolType Tcp        int timeout   5000     int Parse ConfigurationManager AppSettings  socketTimeout   ToString         int ctr   0      IAsyncResult ar   socket BeginConnect endPoint  Connect Callback  socket       ar AsyncWaitHandle WaitOne  timeout  true            Sometimes it returns here as null before it s done checking the connection        No idea why  since  WaitOne   should block that  but it does happen     while  areWeConnected    null  amp  amp  ctr  lt  timeout                Thread Sleep 100           ctr    100           Given 100ms between checks  it allows 50 checks           for a 5 second timeout before we give up and return false  below      if  areWeConnected    true                return true            else               return false           private static void Connect Callback IAsyncResult ar        areWeConnected   null      try               Socket socket    Socket ar AsyncState          areWeConnected   socket Connected          socket EndConnect ar             catch  Exception ex              areWeConnected   false           log exception            Related   How to check if I  39 m connected

[c#] How to configure socket connect timeout

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