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Editorial Team
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Asked: 2026-05-18T09:32:34+00:00

I create my host with the endpointaddress it needs to use, like this: Uri

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I create my host with the endpointaddress it needs to use, like this: 

Uri endpointAddress = new Uri("http://127.0.0.1:5555/MyService");
ServiceHost host = new ServiceHost(myServiceType, endpointAddress);
host.AddServiceEndpoint(implementedContract, basicHttpBinding, string.Empty);

but when I later do host.Open(); I get the exception “HTTP could not register URL http://+:80/MyService/ because TCP port 80 is being used by another application”. The result is the same when I do 

host.AddServiceEndpoint(implementedContract, basicHttpBinding, endpointAddress);

Why would it try to do anything with port 80? How can I solve this?

Update
While trying to provide a more complete code sample, I found the culprit. I added a ServiceMetadataBehavior as follows: 

ServiceMetadataBehavior smb = new ServiceMetadataBehavior();
smb.ExternalMetadataLocation = new Uri(this.ExternalMetadataLocation);
smb.HttpGetEnabled = true;
smb.HttpGetUrl = this.RemovePort(this.EndpointAddress);
host.Description.Behaviors.Add(smb());

It seems that in the past I needed to remove the port from the URL to get this to work, but now that’s exactly what causes the problem.

So Pratik is right: metadata were the problem, and of course the problem with port 80 is that there’s some newly installed application using that port.

Thanks, regards,

Miel.

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1 Answer

  1. Editorial Team

    This is because port 80 is already used by another applicatiion as the error message says, most likely by local IIS server. Try stopping IIS and see, or use another port.
    On vista and above you can use netsh command to check which ports are already reserved

    BTW do you have http metadata or mex endpoints in the app.config or web.config file ?

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