Owin selfhost: using netsh to add an urlAcl seems to cause 503

问题

I have a owin selfhost of a simple WebApi running as a windows service. After creating/installing certificates to aproach this WebApi through https, I got the certificate working but stayed stuck with a return code of 503.

It seemed not a certificate problem, the browser does not complain anymore and shows a closed lock as intended.

I changed the service account during the certificate installation, so to test if that was the problem I changed the listening address back to http. It worked fine

To make this really clear i had owin listening on both http and https

StartOptions options = new StartOptions();
options.Urls.Add(httpAddress); //port_x
options.Urls.Add(httpsAddress); //port_y
_httpServer = WebApp.Start<HttpHost>(options);

//make test calls
GetDataUsingWebClient(httpAddress) // suceeds, content = json
GetDataUsingWebClient(httpsAddress) // statuscode 503, content = 503 message

The result is consistent, approaching httpsAddress/api/test returns 200 + json but httpsAddress/api/test return 503, content = 503 message

With just one listening address (httpsAddress) the service also returns 503

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Update: I did not have an urlacl for the http address, so after adding that

netsh http add urlacl url=http://+:port-nr/ user="NT AUTHORITY\System"

The http address also returned 503! >seems strange to me

The good news is that after deletion of both urlacls it now works, but can anyone explain what happens here?

来源：https://stackoverflow.com/questions/40497970/owin-selfhost-using-netsh-to-add-an-urlacl-seems-to-cause-503