c# - WCF Timeouts larger than configured -

i have configured wcf these timeouts:

  public static nettcpbinding maketcpbinding(bool isclient)   {      return new nettcpbinding(securitymode.none, false)      {         hostnamecomparisonmode = hostnamecomparisonmode.strongwildcard,         transactionflow = false,         portsharingenabled = true,         security = {transport = {clientcredentialtype = tcpclientcredentialtype.none}},         receivetimeout = isclient ? timespan.fromseconds(5) : timespan.fromdays(1),         sendtimeout = isclient ? timespan.fromseconds(1) : timespan.fromseconds(5),         opentimeout = timespan.fromseconds(1),         closetimeout = timespan.fromseconds(5),         maxreceivedmessagesize = int.maxvalue,         listenbacklog = int.maxvalue,         maxbuffersize = int.maxvalue,         maxbufferpoolsize = 524288,         readerquotas =         {            maxarraylength = int.maxvalue,            maxstringcontentlength = int.maxvalue,            maxdepth = int.maxvalue,            maxbytesperread = int.maxvalue,            maxnametablecharcount = int.maxvalue         }      };   } 

which should set imeout 1 second when client connects non-existing server.

however, when calling open, see 21 second timeout.

debug 2013-07-31 18:12:44,712 communication.wcfcommunicator - notifyallreceivers: type: askwhoisawake, sentdate: 7/31/2013 18:12:44 am, detectsessionid: 37106dee-b563-458b-9eb7-a90e81f82563 - 1

debug 2013-07-31 18:13:05,746 communication.wcfcommunicator - not connect net.tcp://notup/xxx.svc/motup_www-xxx-com. connection attempt lasted time span of 00:00:00.9879988. tcp error code 10060: connection attempt failed because connected party did not respond after period of time, or established connection failed because connected host has failed respond 42.42.42.42:808. - 6

what causing 20 second timeout?

solved using async open , setting timeout.

     var ar = client.innerchannel.beginopen(null, null);      if (!ar.asyncwaithandle.waitone(client.endpoint.binding.opentimeout, true))         throw new communicationexception("service not available");      client.innerchannel.endopen(ar);