What were you trying to do that didn't work?

With RHEL Web Console hosted on RHEL 9.3, remote host menu configured to bring up a RHEL 7 host results in "Not connected to host \n protocol-error" error.

Please provide the package NVR for which bug is seen:

Issue is observed after updating to cockpit-300.1-1.el9_3.

With downgrading to 286.2-1.el9_2, then RHEL 7 host is again seen as expected.

How reproducible:

Easy to reproduce.

Steps to reproduce

On RHEL 9.3 host:

1. Install cockpit packages, for example:

   dnf install cockpit cockpit-system 
   

2. Configure authorized ssh access to user (e.g., username ec2-user) on RHEL 7 host (e.g., hostname rh7host) with cockpit configured. The ec2-user on RHEL 7 must have nopasswd sudo rule configured.
3. Configure RHEL 7 host to appear in remote host menu. For example, add /etc/cockpit/machines.d/99-webui.json file like this:

   {
     "rh7host" : {
       "visible" : true,
       "color" : "#67d300",
       "user" : "ec2-user",
       "address" : "rh7host"
     }
   }
   

4. Navigate and login to RHEL Web Console. 
5. Use remote host menu to display rh7host console.

Expected results

System overview of rh7host is displayed on RHEL Web Console.

Actual results

Error message is observed:

Not connected to host
protocol-error

Happy to demonstrate this if you need help reproducing. Thanks!