For the record. Could be of use.
After an upgrade from 8.5 to 22.214.171.124, I could not start any more the new Process Designer. I got a pop-up when trying to log in , displaying an error :
Erreur : Une erreur inattendue s'est produite lors de la tentative de connexion au composant Process Center : peer not authenticated
Edit2 : not a good idea :
A hack in C:\IBM\ProcessDesigner\v8.5\eclipse.ini worked around the issue : removed the "s" from "https" :
Edit1 : nope, it is not that :
But the correct action to fix issue was to not forget after having applied fixpack 126.96.36.199 - to regenerate WAS http plugin in WAS admin console and propagate changes onto our offline frontal web server. Then no need any more to hack. It worked.