Bad Request - Invalid Hostname when accessing localhost Web API or Web App from across LAN

Question

I have an ASP .Net Core 1.1 Web API and Web App running on my localhost from Visual Studio 2017 on Windows 10.

When I run the projects, the API runs on http://localhost:50082/api/ and the web app on http://localhost:60856/

However, if others on the LAN try to access it (using my computer's IP address - http://192.168.1.101:60856/ they get a

Bad Request - Invalid Hostname

Error. In fact,. I get this error too of I use my IP address. I've tried about a dozen variations in my C:\Users\Documents\IISExpress\config\applicationhost.config file, such as:

<bindings>
<binding protocol="http" bindingInformation="*:60856:localhost" />
</bindings>

and

<bindings>
<binding protocol="http" bindingInformation="*:60856:" />
</bindings>

restarting the projects (and therefore IIS Express) every time, but nothing seems to work. Any ideas?

I have also turned off my firewall, and do not have any 3rd party anti-viruses running... — Fabricio Rodriguez, Jul 17 '17 at 14:47

score 9 · Accepted Answer · answered Jul 17 '17 at 16:11

9

IIS Express does not allow remote connections by default. This post explains how to activate it.

In my opinion, you would be better off if you setup local IIS and publish the app to the configured IIS folder.

I already tried HTTP.SYS configurations for other situations, and sometimes the configs are lost whether on restarts or windows updates... But this may not happen to you...

answered Jul 17 '17 at 16:11

João Pereira

1,512
14
18

Thanks, the free VS extension from visualstudiogallery.msdn.microsoft.com/ worked wonders – Fabricio Rodriguez Jul 18 '17 at 07:50
1

Here's the direct link to the extension https://marketplace.visualstudio.com/items?itemName=vs-publisher-1448185.ConveyorbyKeyoti – Jim W says reinstate Monica Apr 12 '18 at 18:17

score 0 · Answer 2 · answered Apr 13 '21 at 19:55

I had this same issue trying to get ngrok to point to a local ASP.NET Core website.

This guy's answer worked for me: https://kodlogs.com/blog/532/iis-express-http-error-400-the-request-hostname-is-invalid

Basically, in the [solution dir]\.vs\[asp.net core web app dir]\config\applicationhost.config file, change the line from:

<binding protocol="https" bindingInformation="*:[your port]:localhost" />

to:

<binding protocol="https" bindingInformation="*:[your port]:*" />

Bad Request - Invalid Hostname when accessing localhost Web API or Web App from across LAN

2 Answers2

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