Wrong Host name of the website in IIS. Domain name with a hyphen doesn't work.

Kornel Mizdalski 5

Hello, I want to run an application in IIS Server and it must run on host name like a "my-app", but it doesn't work. When I try to run the app with domain "my-app.com" it works correctly. Locally on the server everything works correctly, I can open the "my-app" and "my-app.com website, but I need to host the application in a LAN - in a LAN works only "my-app.com". How can I fix that? I can't run the app on domain other than "my-app", it is imposed by the authors.

I working on Widows Server 2022 Standard, SQL Server 2019 Express, IIS v10, the application is made in ASP.NET Web Forms.

AgaveJoe 26,201 Reputation points

2023-02-08T12:36:47.4133333+00:00

Your question is hard to understand. Can you define what "not working" means? Is there any way you can provide the steps that cause the "not working" issue?
MotoX80 31,571 Reputation points

2023-02-08T14:19:38.83+00:00

Sounds like a mismatch between DNS and your IIS bindings. Run nslookup and verify that the names that you want to use resolve to the correct IP address. Then in the IIS bindings for the web site make sure that you have those names defined as a host name.
Yurong Dai-MSFT 2,781 Reputation points Microsoft Vendor

2023-02-09T04:21:40.22+00:00

Hi @Kornel Mizdalski,

According to your description, I couldn’t understand your requirement clearly. How "my-app" doesn't work? Is there any error message? Did you correctly bind "my-app" as your hostname in IIS? Please post more details information about your problem.
Kornel Mizdalski 5 Reputation points

2023-02-09T07:07:35.9833333+00:00

Hi AvageJoe. I mean I can't open the website in the web browser. I've got "Site not found" message.
Kornel Mizdalski 5 Reputation points

2023-02-09T07:17:31.46+00:00

Hi Yurong Dai-MSFT, "my-app" it's a domain name of my website. When I use "my-app.local" name everything it's ok, but for "my-app" name I can't open the website.
Kornel Mizdalski 5 Reputation points

2023-02-09T07:19:36.91+00:00

Hi MotoX80, thank you for your answer, I'll try to check my DNS settings and bindings.
Yurong Dai-MSFT 2,781 Reputation points Microsoft Vendor

2023-02-13T07:44:02.8233333+00:00

Hi @Kornel Mizdalski,

Have you checked your DNS settings and bindings? Is your problem solved? Any progress on this issue? Looking forward to your reply, thank you！
Lex Li (Microsoft) 4,742 Reputation points Microsoft Employee

2023-02-16T06:18:23.4833333+00:00

When people start to learn IIS, the site bindings are not easy to understand. However, here you must interpret them to see whether you choose the right ones and configure DNS properly. If possible, run a diagnostics report and see what it detects, https://docs.jexusmanager.com/tutorials/binding-diagnostics.html#background

1 answer

Kornel Mizdalski 5 Reputation points

2023-02-16T07:35:03.39+00:00

Hi, I found solution for my problem here: https://learn.microsoft.com/en-us/troubleshoot/windows-server/identity/naming-conventions-for-computer-domain-site-ou#dns-domain-names

Single-label DNS names are names that don't contain a suffix, such as .com, .corp, .net, .org, or companyname. For example, host is a single-label DNS name. Most Internet registrars don't allow the registration of single-label DNS names.

The DNS server does not accept a single-label domain names without suffix. When I use "my-app" name, the FQDN looks like this: "my-app." - with dot at the end.
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