Ok, it was a bug, I fixed it.

Ok, I continue, this morning I have change configuration of back office in fact I realise this night that I'm not in https for BO so I change that and proxy-tickets are working for BO

But not for FO and that for all pages !!!

Thanks for answers !!

I've got logs but only for the front not for back-office ? And I don't understand, why ...

That's what I've got for front :

Caused by: org.jasig.cas.client.validation.TicketValidationException:
L'url de rappel du proxy 'https://ent-demo.univ-lemans.fr/plugins/core/authenticate/0?proxy=true&contexts=%2Fsites%2Fent-new%2C%2Fsites-fo%2Fent-new' n'a pu être authentifiée.

Previously, in Ametys 3.5 or 3.8 , I've got but not now...

It seems that CAS application does not succeed to authenticate on the Ametys callback URl and thus the PGT is not created.
Any error stacktrace from Ametys application ?

Yes, you're right...
No I can not see the content from the back-office when I check proxy-tickets...

This happens when you're trying to view the page on which the proxied-content service is displayed, am I right? Are you able to see the content from the back-office ?

That's what I think for the last point...

The application which will be the source of my service 'proxied content with cas authentication' is coded in PHP so I don't know how to put this parameter..

I join my CAS log ! logCAS.txt

Do you have any error log/stacktrace to provide ?

For the last point, I'm not talking about Ametys application, but about the application which will be the source of the service 'proxied content with cas authentication'

Thanks to HELP ME !!!