Visual Studio ASP.NET Docker HTTPs certificate

Question

I'm running Visual Studio 2022, and have Docker Desktop installed (Linux Containers).

When I go file -> new project -> ASP.NET Core Web App and have Configure for HTTPS ticked, Enable Docker ticked and Docker OS as Linux. And then try and Debug the a application with Docker profile selected.

I get the following error:

It says to look at the container tools output but there is nothing that says any error.

Looking at other things people suggest running:

dotnet dev-certs https --clean

dotnet dev-certs https --trust

Which I have done and can see the localhost certificate in the Cert store (Personal & Trusted). But it still results in exactly the same error as above.

I see suggestions to export the certificate via:

dotnet dev-certs https -ep %APPDATA%\ASP.NET\Https\WebApplication1.pfx -p 2e20670b-2656-4d5f-8e5b-b6d782b20113

With 2e20670b-2656-4d5f-8e5b-b6d782b20113 being the UserSecretsId of the project. And I can see the WebApplication1.pfx certificate, a strange thing is that everyone refers to the UserSecrets file having an entry for "Kestrel:Certificates:Development:Password"

But mine is empty. I've tried adding an entry:

{
  "Kestrel:Certificates:Development:Password": "2e20670b-2656-4d5f-8e5b-b6d782b20113"
}

But it still results in the same error.

Please help as I have been going insane with this for the past 4 days.

I was getting this same error and finally figured out I had a duplicate key in my secrets.json file. It must have been preventing VS from adding the Kestrel section. Thought this might help someone else. — dlumpp
– dlumpp, Commented Apr 22, 2024 at 21:23

Igor Pomelnikov · Accepted Answer · 2025-01-10 16:30:04Z

0

I had the same issue after I added another Web API project to my solution and migrated code from the old Web API. I also spent several hours trying to find the problem.

In the end, it was resolved by deleting everything from the %APPDATA%\Microsoft\UserSecrets folder and adding a UserSecretsId to the new project's .csproj file:

<PropertyGroup>
  <UserSecretsId><Paste any random guid here></UserSecretsId>
</PropertyGroup>

Just in case, clean the certificates as well:

dotnet dev-certs https --clean
dotnet dev-certs https -t

answered Jan 10 at 16:30

Igor Pomelnikov

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