Thank you for your hint jolentes. I will move that instance into my test area and will perform the steps suggested in the article you linked at a later time. Although i have no reference to Heimdal in my system diagnostic page therefore i am kind of inclined to believe that your issue, even if it seems to be similar to mine, has a different root cause.
To the forum admins: This is going to be a production system, therefore, i am won’t repair it and go with it as I’d rather perform a full reinstallation since it’s basically an unconfigured UCS. I will mark this post as solved if you wish.