There was an issue with the backend service pulp3: Pulp redis connection issue at https://sysadmin.foreman.com/pulp/api/v3

Support
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5

Please remember, that you can’t run Foreman 3.3 with Katello 4.4, you need to roll back both :slightly_smiling_face:
But good luck! (I fortunately had a system snapshot)

(that might also be the time I could mention the other thread I opened for that to not have to duplicate the information Upgrade issue to 4.4.1 - Internal Server Error (and a notice about 4.5 RC2) )