I have a block in my pipeline script like the following:

		docker.withRegistry("http://ourhost:5100", params.JP_DockerMechIdCredential) {
			def	image = docker.build("com.att.sharedservices/tomee-uslmonitor")
			image.push 'latest'
		}

Before this block of code, I extracted the username and password from the credential, and they are correct.

In the log, I watched it build the image, tag it, but then when it tried to push it, it failed to authenticate. I didn't see a "docker login" command line in the log.

I then tried to manually run the docker commands from the shell, on the same box the job is running on, starting with "docker login". That entire process worked.

I then reran my job, and it also worked.

I then moved my "~/.docker/config.json" file out of the way and reran my job, and it failed to authenticate again. It's just not attempting "docker login".