I’d check 2 things, actual connectivity to ibnodo15 from the webnode (on the right port) and whether ibnodo15 fits into the host_regex you have specified in ood_portal.yml.
Lastly as debug steps try curl from various places just as a spot check for connectivity and that mflow is responding with something. We see that mlflow started with an ip address. Is this the right IP address? Does ibnodo15 resolve to it everywhere?
Not yet, but may be your next issue if you start to see traffic to the backend mlflow server. Right now, you can’t even connect or proxy to it.
This is all about whether you set to this to be /node (node origin apps like Jupyter have the host + port in the path) or /rnode (rnode origin apps cannot change their URLs so they’re relative to /host/port).