CODEWITHSUNDEEP
c#udp
ispiro
ispiro

Reputation: 27723

Trying a UdpClient example from MS and getting an error. Why?

I’m trying to get two instances of my program to communicate between them. I’ve been referred to udp, and so I’m trying to run the example from here: http://msdn.microsoft.com/en-us/library/system.net.sockets.udpclient%28v=VS.100%29.aspx But I get an error: "socketexception (0x80004005): This is usually a temporary error during hostname resolution..."

how do I solve this?

I don’t know anything about this stuff. I googled for what I needed and found this here:

//This is how you do it (kudos to sipwiz)
    UdpClient udpServer = new UdpClient(localpt); //This is what the proprietary(see question) sender would do (nothing special) 

    //!!! The following 3 lines is what the poster needs...(and the definition of localpt (of course))
    UdpClient udpServer2 = new UdpClient();
    udpServer2.Client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
    udpServer2.Client.Bind(localpt);

Thanks

Upvotes: 0

Views: 929

Answers (2)

TheCodeKing
TheCodeKing

Reputation: 19230

The issue is you are using the code for the sample unmodified.

This is trying to connect to AlternateHostMachineName which does not exist, and therefore throws a 0x80004005: No such host is known exception.

You need to amend the code to connect to a real server.

Upvotes: 2

Yahia
Yahia

Reputation: 70379

The reason is that you are refering to hostnames that can't be resolved and/or your network settings (esp. DNS) are are somehow wrong...

The example you refer to contains two hostnames www.contoso.com and AlternateHostMachineName - both are not resolvable since they don't exist... you need to replace them with real hostnames or IP adresses and make sure that your DNS settings are correct/working...

Upvotes: 1

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