S/4 HANA CAL Free Trial Edition : system connection issue

Hello,

We have activated the CAL S/4 free trial solution yesterday.

When trying to connect the S/4 systems through Windows Frontend Server, (see option 1 of 1.2 System Connection in S4HANAOPTRIAL_USER_GUIDE_EN.pdf), we receive the following error message when connecting to the S/4 HANA system through the sapgui interface :

When running the fiori launchpad, we receive a timeout message :

The server at vhcalerpci.dummy.nodomain is taking too long to respond.

Only the BI launchpad seems ok.

Has someone encountered this problem ? Any idea ?

Thanks