"bad request (invalid hostname)" appears when deployed for virtual hosting


Bad Request - Invalid Hostname HTTPhường. Error 400. The request hostname is invalid.

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I don"t even know where to begin to lớn diagnose this problem



Did you check the binding is IIS? (inetmgr.exe) It may not be registered khổng lồ accept all hostnames on 8080.

For example, if you mix it up for mysite.com:8080 and hit it at localhost:8080, IIS will get the request but not have a hostname binding to match so it rejects.

Outside of that, you should kiểm tra the IIS logs (C:inetpublogswmsvc#) on the VPS và see if you are seeing your request. Then you"ll know if its a problem on your client or on the server itself.


FWIW, if you"d lượt thích lớn just allow requests directed to any hostname/ip then you can phối your binding like so:

I use this binding so that I can load a VM with IE6 and then debug my application.

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EDIT: While using IIS Express khổng lồ debug, the mặc định location for this option"s config tệp tin is




This page by Microsoft describes how khổng lồ mix up access to IIS Server Express from other computers on the local network.

In a nutshell:

1) from a comm& prompt with admin privileges:

netsh http add urlacl url=http://:8181/ user=everyone2) In Windows Firewall with Advanced Security, create a new inbound rule for port 8181 lớn allow external connections

3) In applicationhost.config, in the node for your project, add:

Do NOT add (as was suggested in another answer):

The above sầu wildthẻ binding broke my access from

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edited Aquảng bá 24 "15 at 9:41
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answered Oct 29 "14 at 22:44
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So, I solved this by going to my website in IIS Manager & changing the host name in site bindings from localhost khổng lồ *. Started working immediately.


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answered Aug 10 "15 at 17:00
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For Visual Studio 2017 và Visual Studio 2015, IIS Express settings is stored in the hidden .vs directory and the path is something like this .vsconfigapplicationhost.config, add binding like below will work


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edited Aug 24 "20 at 18:55
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answered Oct 23 "17 at 9:39
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Don"t forget to bind to the IPv6 address as well! I was trying to lớn add a site on using localhost và got the bad request/invalid hostname error. When I pinged localhost it resolved to lớn ::1 since IPv6 was enabled so I just had khổng lồ add the additional binding lớn fix the issue.


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answered Oct 30 "15 at 21:45
Jeff CameraJeff Camera
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This solved my problem (sorry for my bad English):

open cmd as administrator and run command (Without the square brackets):netsh http add urlacl url=http://:/ user=everyone

in documents/iisexpress/config/applicationhost.config và in your root project folder in (hidden) folder: .vs/config/applicationhost.config you need add row to "site" tag:

open "internet information services (iis) manager"(khổng lồ find it: in search in taskbar write "Turn Window features on or off" and open result và then kiểm tra the checkbox "internet information service" and install that):

in left screen click: computer-name --> Sites --> Default Web Site andthen cliông chồng in right screen "Binding"clichồng Add buttonwrite what you need and press "OK".

open "Windows Firewall With Advanced Security",

in left screen press "Inbound Rules" & thenpress in right screen "New Rule..."check port and press Next,check TCPhường. & your port & press Next,check "Allow the connection" and press Next,check all checkbox & press Next,write name và press Finish.


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