[BitBucket date: 2018-05-31.10:22:31]

When orthanc is started with --trace option, no matter if AuthenticationEnabled was set to true or false in the config file, you will observe auth to be enabled

If started with --verbose it respects the AuthenticationEnabled flag

[BitBucket user: Sébastien Jodogne]
[BitBucket date: 2018-05-31.11:31:54]

I cannot reproduce this issue. It is most probably due to the cache of your Web browser. Please give a try by starting Orthanc in "--trace" mode, closing your browser, then opening Orthanc Explorer again.

[BitBucket user: Marek Kwasecki]
[BitBucket date: 2018-05-31.20:40:31]

It so happened that I've messed up with docker run params and there was the mistake not with Orthanc. By adding additional params to docker run invocation I have overwritten CMD params from Dockerfile. That caused Orthanc binary to be ran without the config (but with --trace)
Further testing with the not-in-docker-image Orthanc proved me wrong.
I'm sorry for taking your time. I was too hasty.

[BitBucket user: Sébastien Jodogne]
[BitBucket date: 2018-05-31.21:35:56]

Fine, closing the issue thus.