Bad Request - Invalid Hostname IIS7

Question

When I try to hit my web app on port 8080 I get the following error     Bad Request - Invalid Hostname   HTTP Error 400  The request hostname is invalid    I don t even know where to begin to diagnose this problem

User · Answer

Double check the exact URL you re providing  I saw this error when I missed off the route prefix defined in ASP NET so it didn t know where to route the request

User · Answer

You can use Visual Studio 2005 2008 2010 CMD tool  Run it as admin  and write  aspnet regiis -i   At last I can run my app successfully

User · Answer

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    ip adress   port   user everyone  in documents iisexpress config applicationhost config and in your root project folder in  hidden  folder   vs config applicationhost config you need add row to  quot site quot  tag   lt binding protocol  quot http quot  bindingInformation  quot   8080 192 xxx xxx xxx quot    gt   open  quot internet information services  iis  manager quot   to find it  in search in taskbar write  quot Turn Window features on or off quot  and open result and then check the checkbox  quot internet information service quot  and install that    in left screen click  computer-name -- gt  Sites -- gt  Default Web Site and then click in right screen  quot Binding quot  click Add button write what you need and press  quot OK quot     open  quot Windows Firewall With Advanced Security quot    in left screen press  quot Inbound Rules quot  and then press in right screen  quot New Rule    quot  check port and press Next  check TCP and your port and press Next  check  quot Allow the connection quot  and press Next  check all checkbox and press Next  write name and press Finish    done

User · Answer

This page by Microsoft describes how to set up access to IIS Server Express from other computers on the local network   In a nutshell   1  from a command prompt with admin privileges   netsh http add urlacl url http    your ip address  8181  user everyone   2  In Windows Firewall with Advanced Security  create a new inbound rule for port 8181 to allow external connections  3  In applicationhost config  in the  node for your project  add    lt binding protocol  http  bindingInformation    8181  your ip address     gt   Do NOT add  as was suggested in another answer     lt binding protocol  http  bindingInformation    8181      gt   The above wildcard binding broke my access from http   192 168 1 6 8181

User · Answer

Don t forget to bind to the IPv6 address as well  I was trying to add a site on 127 0 0 1 using localhost and got the bad request invalid hostname error  When I pinged localhost it resolved to   1 since IPv6 was enabled so I just had to add the additional binding to fix the issue

User · Answer

I m not sure if this was your problem but for anyone that s trying to access his web application from his machine and having this problem   Make sure you re connecting to 127 0 0 1  a k a localhost  and not to your external IP address   Your URL should be something like http   localhost 8181  or http   127 0 0 1 8181 and not http   YourExternalIPaddress 8181     Additional information  The reason this works is because your firewall may block your own request  It can be a firewall on your OS and it can be  the usual  your router   When you connect to your external IP address  you connect to you from the internet  as if you were a stranger  or a hacker   However when you connect to your localhost  you connect locally as yourself and the block is obviously not needed   amp  avoided altogether

User · Answer

If working on local server or you haven t got domain name  delete  Host Name   field

User · Answer

FWIW  if you d like to just allow requests directed to any hostname ip then you can set your binding like so    lt binding protocol  http  bindingInformation    80      gt    I use this binding so that I can load a VM with IE6 and then debug my application     EDIT  While using IIS Express to debug  the default location for this option s config file is  C  Users  User  Documents IISExpress config applicationhost config

User · Answer

So  I solved this by going to my website in IIS Manager and changing the host name in site bindings from localhost to    Started working immediately

User · Answer

Did you check the binding is IIS   inetmgr exe   It may not be registered to accept all hostnames on 8080   For example  if you set 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 check the IIS logs  C  inetpub logs wmsvc   on the server and see if you are seeing your request   Then you ll know if its a problem on your client or on the server itself

User · Answer

I saw the same error after using msdeploy to copy the application to a new server  It turned out that the bindings were still using the IP address from the previous server   So  double check IP address in the IIS bindings    Seems obvious after the fact  but did not immediately occur to me to check it

User · Answer

I got this error when I tried to call a webservice using  localhost   I fixed it by using the actual IP instead  192 168

User · Answer

Check your local hosts file  C  Windows System32 drivers etc hosts for example   In my case I had previously used this to point a URL to a dev box and then forgotten about it  When I then reused the same URL I kept getting Bad Request  Invalid Hostname  because the traffic was going to the wrong server

User · Answer

For Visual Studio 2017 and Visual Studio 2015  IIS Express settings is stored in the hidden  vs directory and the path is something like this  vs config applicationhost config  add binding like below will work  lt bindings gt       lt binding protocol  quot http quot  bindingInformation  quot   8802 localhost quot    gt       lt binding protocol  quot http quot  bindingInformation  quot   8802 127 0 0 1 quot    gt   lt  bindings gt   Syntax  https   docs microsoft com en-us dotnet api microsoft web administration binding bindinginformation view iis-dotnet

User · Answer

Make sure IIS is listening to your port   In my case this was the issue  So I had to change my port to something else like 8083 and it solved this issue

[iis-7] Bad Request - Invalid Hostname IIS7

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