I have been looking at this far too long, and I’m stumped. I resolved a similar problem yesterday on another server. That was down to the ORACLE_HOME setting in listener.ora having a ‘1’ in it rather than a ‘2’. Took ages to spot that. Anyway, here the stuff you’ll need to know to sort this for me, or suggest stuff. It’s a question on Oracle L seeing as there is a lot of evidence to post.