We have a WCF application with Silverlight 4.0 client application. The system worked well but just sometimes we got the following error:
The HTTP request to http://xxx has exceeded the allotted timeout. The time allotted to this operation may have been a portion of a longer timeout.
We traced the bug using Visual Studio 2010 and got the following popup message:
There are some solutions on internet. most of cases start from add the following content in WCF’s web.config file or app.config file (self-host WCF):
<basicHttpBinding> <binding name="BasicHttpBinding_ConspecService" maxBufferPoolSize="2147483647" maxReceivedMessageSize="2147483647" maxBufferSize="2147483647" receiveTimeout="00:10:00" sendTimeout="00:10:00" openTimeout="00:10:00" closeTimeout="00:10:00" > </binding> </basicHttpBinding>
But, it will NOT help. the error still come.
**The final solution is “Specifies the maximum number of connections to a network host” **
The following code example configures an application to use four connections to the server www.???.com and 80 connections to all other servers.
In config file (WCF side):
<?xml version="1.0" encoding="utf-8" ?> <configuration> <system.net> <connectionManagement> <add address="*" maxconnection="80"/> <add address = http://www.???.com maxconnection = "4" /> </connectionManagement> </system.net> </configuration>
Or code behind (WCF side):
//how many outgoing connection that can make to a single endpoint. Default Value is 2 System.Net.ServicePointManager.DefaultConnectionLimit = 80;