Internal pages are password-protected. Password-protection has to be set up by the CMS-support.
Please send an e-mail to firstname.lastname@example.org incating
the complete path to the protected folder, e.g.
ROOTPUB / physik / en / einrichtungen / ag-XYZ / <foldername>
You can test the access to a protected page here. (Please note that you will not have access as you do not belong to the group of authorized persons.)