OPC UA without certificate

Is it possible to connect to OPC UA server without certificate?

I get connection 'faulted' when I try to.

Security mode = None
Security policy = None

I also try disable (uncheck) - Security - Certificate Validation Enable, still faulted.

I am able to connect using uaexpert by accepting below:

Are you trying to connect to Ignition's default OPCUA Server?

No, I am connecting to another server. Ignition will be the client.

There's an advanced setting on OPC UA connections to disable certificate validation, you can give that a try.

The only configuration where certificates aren't checked at all (I think), is when you have no security and are using an anonymous identity instead of username/password.