unable to map subdomain in local host webserver - asp.net-mvc

I am developing a web application using Asp.net mvc framework with concept of sub domain for community.
I have implement concept of wild card mapping of domain like *.example.com. To test concept in vs 2008 i edited hosts file and add some sub domain like
127.0.0.1 a.localhost
127.0.0.1 b.localhost
When i request url http://a.localhost:1760/ i get error
While trying to retrieve the URL: http://a.localhost:1760/
The following error was encountered:
Unable to determine IP address from host name for a.localhost
The dnsserver returned:
Name Error: The domain name does not exist.
This means that:
The cache was not able to resolve the hostname presented in the URL.
Check if the address is correct.
What i should do to resolve this error.

localhost can't have subdomains - it's a reserved DNS name that simply doesn't support them. You could, instead, use a.myhost.example and b.myhost.example, but be aware that Cassini, the VS development web server doesn't understand host headers.

Related

How can I customize Cloud Run application URL?

If you run an application on Cloud Run and deployed container by opening this URL in a web browser the URL comes like this:
this_cloud_run_format.run.app
Can this URL be customized and how ?
Google Cloud Run does not support changing the auto-generated service URL.
You can set up a custom domain using Cloud Run Domain Mapping.
Mapping custom domains
You will need to own/control the domain and be able to create resource records at the authoritative name servers (DNS server) for the domain.

asp.net core RC2 iis hosting

I have hosted asp.net core app in IIS on window server 2012 R2 Standard. My site works fine when I use localhost based URL on the machine but when I try to access the URL using host name/machine name from network computer it does not work. What do I need to do to make it accessible from other computers?
There can be different reason for this:
Check your firewall to make sure your port 80 is open.
Check that the hostname point to the IP URL of your server.
What is the http code returned by the it does not work?
Tool:
Enter the Domain and IP, make sure they point to the same place.
http://www.hcidata.info/host2ip.htm
If firewall isn't the problem, and the site works via localhost on the server, make sure your IIS bindings are correct. Right click site, edit bindings, verify the domain / ip / etc match how you're trying to access it.

Access site from public ip

When I debug my asp.net mvc3 web application on http://localhost:11118/ using microsoft visual studio and it works perfectly.
But when I try to view it on http://MYPUBLICIPADRESS:11118/ I get a HTTP Error 404. The requested resource is not found. message. I portforwarded port 1118 correctly. I have no problems doing the same using apache.
How can I get this to work?
The Visual Studio internal server only accepts connection coming from localhost. You should use IIS Express (and manually change the config file) to let it accept connection using other hostnames, including the computer name.
You can read more about setting the server of your preferences on MSDN

IIS Default Site

I have an IIS configuration such that [mywebapp] is an asp.net mvc web app that exists under "Default Web Site" of myserver.com.
How do I configure my IIS so that a request to www.myserver.com actually displays the home page of [mywebapp], without changing the url to www.myserver.com/mywebapp. Currently the url change is what happens as I am using HttpRedirect on Default Web Site, but this is not what I want.
Assuming that you have a DNS record set that maps your server IP address to the domain name, you will need to set up a new site, rather than a virtual directory underneath Default website. When you create the site, enter your domain name in the Host name field.
You can test this configuration locally first by setting the site up in IIS and then adding an entry in your hosts file (C:\Windows\System32\drivers\etc\hosts) that maps the domain name to your localhost IP address 127.0.0.1 - just remember to remove that once you're happy with the setup or you won't actually be hitting the live IP address.

ASP MVC Preview 5 and IIS 6 Windows Authentication

I've just built a basic ASP MVC web site for deployment on our intranet. It expects users to be on the same domain as the IIS box and if you're not an authenticated Windows User, you should not get access.
I've just deployed this to IIS6 running on Server 2003 R2 SP2. The web app is configured with it's own pool with it's own pool user account. The IIS Directory Security options for the web app are set to "Windows Integrated Security" only and the web.config file has:
<authentication mode="Windows" />
From a Remote Desktop session on the IIS6 server itself, an IE7 browser window can successfully authenticate and navigate the web app if accessed via http://localhost/myapp.
However, also from the server, if accessed via the server's name (ie http://myserver/myapp) then IE7 presents a credentials dialog which after three attempts entering the correct credentials eventually returns "HTTP Error 401.1 - Unauthorized: Access is denied due to invalid credentials".
The same problem occurs when a workstation browses to the web app url (naturally using the server's name and not "localhost").
The IIS6 server is a member of the only domain we have and has no firewall enabled.
Is there something I have failed to configure correctly for this to work?
Thanks,
I have tried the suggestions from Matt Ryan, Graphain, and Mike Dimmick to date without success. I have just built a virtual machine test lab with a Server 2003 DC and a separate server 2003 IIS6 server and I am able to replicate the problem.
I am seeing an entry in the IIS6 server's System Event Log the first time I try to access the site via the non-localhost url (ie http://iis/myapp). FQDN urls fail too.
Source: Kerberos, Event ID: 4
The kerberos client received a KRB_AP_ERR_MODIFIED error from the server host/iis.test.local. The target name used was HTTP/iis.test.local. This indicates that the password used to encrypt the kerberos service ticket is different than that on the target server. Commonly, this is due to identically named machine accounts in the target realm (TEST.LOCAL), and the client realm.
After extensive Googling I managed to find a solution on the following MSDN article:
How To: Create a Service Account for an ASP.NET 2.0 Application
Specifically the Additional Considerations section which describes "Creating Service Principal Names (SPNs) for Domain Accounts" using the setspn tool from the Windows Support Tools:
setspn -A HTTP/myserver MYDOMAIN\MyPoolUser
setspn -A HTTP/myserver.fqdn.com MYDOMAIN\MyPoolUser
This solved my problem on both my virtual test lab and my original problem server.
There is also an important note in the article that using Windows Authentication with custom pool users constrains the associated DNS name to be used by that pool only. That is, another pool with another identity would need to be associated with a different DNS name.
Sounds like the new Loopback check security feature of Windows Server 2003 SP1. As I understand it, is designed to prevent a particular type of interception attack.
From http://support.microsoft.com/kb/896861
SYMPTOMS
When you use the fully qualified domain name (FQDN) or a custom host header to browse a local Web site that is hosted on a computer that is running Microsoft Internet Information Services (IIS) 5.1 or IIS 6, you may receive an error message that resembles the following:
HTTP 401.1 - Unauthorized: Logon Failed
This issue occurs when the Web site uses Integrated Authentication and has a name that is mapped to the local loopback address.
Note You only receive this error message if you try to browse the Web site directly on the server. If you browse the Web site from a client computer, the Web site works as expected.
CAUSE
This issue occurs if you install Microsoft Windows XP Service Pack 2 (SP2) or Microsoft Windows Server 2003 Service Pack 1 (SP1). Windows XP SP2 and Windows Server 2003 SP1 include a loopback check security feature that is designed to help prevent reflection attacks on your computer. Therefore, authentication fails if the FQDN or the custom host header that you use does not match the local computer name.
Workaround
Method 1: Disable the loopback check
Method 2: Specify host names
See http://support.microsoft.com/kb/896861 for details.
Edit - just noticed that you said you were seeing this from Client PCs as well... that's more unusual. But I'd still look to test one of these workarounds, to see if it corrected the problem (and if so, might indicate a problem with your DNS config).
It sounds to me as though you've done everything right.
I'm sure you are but have you made sure you are using 'DOMAIN\user' as the user account and not just 'user'?
IE7 only sends Windows credentials (NTLM, Kerberos) if it identifies the server as being on the Intranet. IE7 also added an Intranet zone lockdown feature - if you're not on a domain, by default no servers are in the Intranet zone. This was done to prevent zone-migration attacks.
To change this, go to Tools/Internet Options, Security tab, then click Local Intranet. You can then manually add servers that should be treated as Intranet, by clicking the Sites button, then Advanced, or tell IE not to automatically detect your Intranet and selecting the other checkboxes as appropriate.
I just encountered the opposite problem - my site authenticates externally but not locally.
I compared it to the sites we have working and the difference was that the site that failed to authenticate was using Windows Authentication.
However, other sites I work with (this is a dev server) tend to have Basic Authentication.
Not sure why exactly but this fixed it.
However, at the same time I noticed "Default Domain" and "Realm" settings.
I know it's very unlikely but could these perhaps help at all?

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