Hi, thanks for your answer,
The error of not being able to connect is due to the fact that I tired using HTTPS, while I do not have SSL. Hence I have to use http on port 1128, as stated here :
I can now continue with the installation, following the SUM steps.
EDIT 1: it asked me for an xml file, I indicated the path to the SPS14_xml, which is the the SPS14 media downloaded from the launchpad.sap.
EDIT 2 : also had to update the SPAM/SAINT, I followed this tutorial except that I copied the file on my client and uploaded it from theree SAP SPAM/SAINT UPDATE - SAP BASIS Tuts
EDIT 3: Trying to update the kernel (SAPEXE_[...] and SAPEXEDB_[...]) according to note 211077