ASP NET MVC 6 Web App hosted on Azure not running

Question

I have a MVC 6 application which is hosted in Azure as web app. It is running fine on local by iisexpress but when I hosted it in Azure using publish option in Visual Studio, it is not working. It is just waiting to load website. After 4-5 minutes wait, it displays nothing.

I also tested it with static file. I uploaded a static html file in wwwroot folder but it is also not working.

I am not getting how can I see the actual error. Anybody can help me?

Do you get any errors? What happens if you try to start the app manually (App Services > Your App Service > Tools > Console > cd \home\site\approot and run the web.cmd in there)? — Tseng
– Tseng, Commented Apr 24, 2016 at 14:19

Tseng · Accepted Answer · 2016-04-30 08:18:46Z

1

Since you've provided almost no information I gonna have to guess, since I had a similar error this weekend when deploying an ASP.NET Core 1.0 WebApp to an Azure App Service.

The issue I was facing was, that the main application wouldn't start. After a couple of hours trying to figure it out I got an error message with the method mentioned in the comments (running web.cmd manually) which returned an Microsoft.AspNet.Server.Kestrel.Networking.UvException: Error -4089 EAFNOSUPPORT address family not supported exception.

I couldn't find anything directly related to it, but was a hint about an IPv6 problem. A few other SO posts hinted that setting http://*:12345 as port binds to both, IPv4 and IPv6. So after I changed the url to http://0.0.0.0:12345 in the hosting.json, it started without issues.

I filled an issue on Kestrel GitHub and this seems to be a bug in Kestrel.

Edit: In response to the comment:

I used to have

{
  "server": "Microsoft.AspNet.Server.Kestrel",
  "server.urls": "http://*:8081"
}

and changed it to

{
  "server": "Microsoft.AspNet.Server.Kestrel",
  "server.urls": "http://0.0.0.0:8081"
}

The difference seems to be that http://*:8081 also binds to both IPv4 and IPv6 on the same port, whereas http://0.0.0.0:8081 only binds on IPv4 and not on IPv6.

edited Apr 30, 2016 at 8:18

answered Apr 25, 2016 at 6:36

Tseng

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2 Comments

Stephen Gilboy Over a year ago

What is the setting you added to hosting.json? Or what does your hosting.json file look like?

Tseng Over a year ago

@Stephen: Updated my answer

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