Private Docker Registry: 'x509: certificate signed by unknown authority' only for Windows images

Question

While trying to pull Windows images from a Private Docker Registry, I'm getting the following error

x509: certificate signed by unknown authority

I've installed the proper certificate and I can pull Linux images without any issue, but for some reason I'm unable to pull Windows ones.

My co-workers don't have this problem.

Any ideas on this one?

Possible duplicate of [Docker Private Registry: x509: certificate signed by unknown authority](https://stackoverflow.com/questions/39177630/docker-private-registry-x509-certificate-signed-by-unknown-authority) — Akshay barahate, Apr 25 '19 at 13:04

Nicola Ben · Accepted Answer · 2019-04-25T13:00:38.323

18

To add an insecure docker registry, add the file /etc/docker/daemon.json (in Linux) with the following content:

{
    "insecure-registries" : [ "your.registry.host:5000" ]
}

and then you need to restart docker.

In case of Windows the file is at the following path: C:\ProgramData\docker\config\daemon.json

edited Apr 25 '19 at 13:00

answered Jul 10 '18 at 08:11

Nicola Ben

Sorry, I forgot to specify I'm pulling images from a Windows machine. – eduherminio Jul 10 '18 at 10:59
However, adding it as an insecure docker registry through Windows Docker settings made it work, **although that step isn't needed to download Linux containers**. Please edit the answer to include Windows solution and I'll accept it – eduherminio Jul 10 '18 at 11:09

score 6 · Answer 2 · answered Apr 01 '21 at 14:35

6

In windows you can find that file in

C:\Program Files\Docker\Docker\resources\windows-daemon-options.json

Make the suggested changes by Nicola Ben and then restart the docker.

answered Apr 01 '21 at 14:35

Sudip Ghosh

2 Answers2