Unable to set Continuous Update in Channel
I have 4 servers, and I've successfully set the Channel on 2 of them to Continuous Update. On the other 2 - identical VMs running identical software when built a couple of weeks ago - it fails when I try to do this. As soon as i click on "Set", I jump back to the previous screen, and it has a large red horizontal bar telling me, "Can not set channel! Wrong status." The only thing I see different is that on the 2 that fail, "Status:" is set to "Checking for new packages" while on the 2 that succeeded, it is set to, "Server is up to date".
Steps to reproduce:
On Compute main screen, click on "Servers" in the left column.
Click on the server.
Click on Update on bottom right of screen.
Click on "Channels' (currently set to "centos_7.7 (Current Release)", so select "centos7.x (Continuous Update)"
Click on "Set'
Red bar of sadness will appear.
On the server in question, I've run:
yum check-update - Nothing available
yum upgrade - Nothing available rhn_check - Nothing new
I've checked for a running/stuck yum command, or rpm command, and neither appears to be running, causing the package update to freeze.
How can I get past this issue? Has anyone else had this issue?