When I connect to the middleware server (Windows) I got the following error:
"plumbing executable encountered a problem and needed to be closed"
The quest_sc_mw process created a dump file and the whole connection crashed.
The monitored database was removed without uninstalling or stopping Performance Analysis. Later the database has be recreated with the same name.
This action corrupted the middleware installation for this database.
Remove the middleware installation and the collector and reinstall from the scratch.
The steps how to remove the installation - some steps might be needed to be done manually - you will find here:
The long term repository can be reused for this instance.