dot NET Core - Build Successful but Run error - Hmmm… can't reach this page

Question

dot NET Core - Build Successful but Run error - Hmmm… can't reach this page

Swapnil Giram 0 Microsoft Employee

Hi All,

I cloned project code from Azure Repo, installed certificates, configured Project Web Properties, configured applicationhost.config, setup SSL URL in IIS using certificate Thumbprint. My project builds successfully, but application fails to load in browser. I get error "Hmmm… can't reach this page". When I click 'i' icon in browser address bar, it shows "This site does not have a certificate. - This site does not have a certificate.".

Same certificates work for all my colleagues, I wonder why its failing on my machine only.

Tianyu Sun-MSFT 33,546 Reputation points Microsoft External Staff

2025-02-26T08:55:50.1433333+00:00

Hi @Swapnil Giram,

Did you check the TLS related settings between the client and the server? Are they inconsistent?

If you try to clean the project cache(bin, obj and the hidden .vs folder), rebuild and rerun the project. And restart IIS, will the error disappear?
Swapnil Giram 0 Reputation points Microsoft Employee

2025-02-28T10:47:49.1433333+00:00
@Anonymous Thank you for response. I am trying to run my web application locally. I have Visual Studio 2019 Enterprise and IIS Express 10.

my issue is still not resolved. See below more details:

I am using Visual Studio 2019 Enterprise

I have dot NET Core Web application

I imported SSL certificate into Local Computer > Personal store

I have IIS Express 10 which got installed automatically with VS, not IIS as its not needed.

I configured applicationhost.config file in .vs folder of my project as below:

<site name="Project.Portal" id="2">

<application path="/" applicationPool="Clr4IntegratedAppPool"> <virtualDirectory path="/" physicalPath="C:\Users\abc\source\repos\SolutionName\ProjectName" /> </application> <bindings> <binding protocol="http" bindingInformation="*:8379:localhost" /> <binding protocol="https" bindingInformation="*:6352:localhost" /> <binding protocol="https" bindingInformation="*:6352:myportal.com" /> </bindings> </site>

I ran below IIS command from command prompt in admin mode

cd C:\Program Files (x86)\IIS Express

IisExpressAdminCmd.exe setupsslUrl -url:https://myportal.com:6352/ -CertHash:<Certificate Hash from Certificate Details Thumbprint>

Updated hosts file under C:\Windows\System32\drivers\etc, and add the following entry 127.0.0.1 - myportal.com

Updated Project's csproj file in Visual Studio (administrator privilege required) with the following: Under 'Web' tab >

Start URL: https://myportal.com:6352/

Apply server settings to all users (store in project file) IIS Express > Bitness: Default > Create Virtual Directory Selected - 'Override application root URL' and entered same URL as above i.e. https://myportal.com:6352/

Now I rebuild my project and it succeeds without any error or warning

I click 'IIS Express (Microsoft Edge)' button to run the application

Browser window opens with project URL in address bar - https://myportal.com:6352/

but instead of loading the page, I get error "Hmmm… can't reach this page".

when I click 'i' icon in front of URL to look for site information, it shows me message - "Your connection to this site isn't secure This site does not have a certificate. Because this connection is not secure, information (such as passwords or credit cards) will not be securely sent to this site and may be intercepted or seen by others." I have also tried below things:

deleted applicationhost.config file from folder C:\Users\abc\Documents\IISExpress\config. Then ran application which recreated this file

to created same <bindings>entries in applicationhost.config file from folder C:\Users\abc\Documents\IISExpress\config.

Clear browser cache and run web app in InPrivate mode

delete and reimport SSL certificate

import same certificate in 'Trusted Root Certification Authority' folder of Certificates Local Computer using mmc.exe But it did not resolve my issue.

Hope this detail helps Do you have any more suggestions to fix my issue?
XuDong Peng-MSFT 11,656 Reputation points Microsoft External Staff

2025-03-04T08:57:25.14+00:00

Hi @Swapnil Giram,

It looks like you are using a custom SSL port to test SSL access to your site, try changing it to a port between 44300 and 44399. You can also try repairing IIS Express 10 to see if that works for you.

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Tianyu Sun-MSFT 33,546 Reputation points Microsoft External Staff

2025-02-26T08:55:50.1433333+00:00

Hi @Swapnil Giram,

Did you check the TLS related settings between the client and the server? Are they inconsistent?

If you try to clean the project cache(bin, obj and the hidden .vs folder), rebuild and rerun the project. And restart IIS, will the error disappear?
XuDong Peng-MSFT 11,656 Reputation points Microsoft External Staff

2025-03-04T08:57:25.14+00:00

Hi @Swapnil Giram,

It looks like you are using a custom SSL port to test SSL access to your site, try changing it to a port between 44300 and 44399. You can also try repairing IIS Express 10 to see if that works for you.

Answer 1

Swapnil Giram 0 Microsoft Employee

Thank you everyone for your suggestions. It turns out that my computer only reads IPV6 ip address, so I used ::1 in Windows host file mapping to URL instead of 127.0.0.1 and it resolved the issue.

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dot NET Core - Build Successful but Run error - Hmmm… can't reach this page

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