Hosting WebAPI using OWIN in a windows service

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Your machine’s firewall could be blocking the incoming requests. You could do:

You could Run wf.msc command to open up Windows Firewall with Advanced Security and add a new Inbound Rule for TCP port 80.

(You should notice couple of inbound rules starting with World Wide Web Services.... These are for IIS. I am not sure if enabling these rules would be enough to even allow your windows service to receive the requests…you can try and see if this works otherwise as suggested before, you can create a new inbound rule..)

Update:
Based on your comment, it could be that because of your Url registrations you are unable to hit the service. Following are some examples of registering multiple urls with HttpListener.

StartOptions options = new StartOptions();
options.Urls.Add("http://localhost:9095");
options.Urls.Add("http://127.0.0.1:9095");
options.Urls.Add(string.Format("http://{0}:9095", Environment.MachineName));

using (WebApp.Start<Program>(options))
{

You can read more about the url registration in the following links:
http://technet.microsoft.com/en-us/library/bb630429.aspx
http://technet.microsoft.com/en-us/library/bb677364.aspx

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