Hi, check under
/nwa : Application Modules : Overview
- portal application - com.sap.portal.ivs.httpservice
- service - proxy
See more at : Defining a Proxy Server for the Portal - Configuring the Portal for Initial Use - SAP Library
The first entry is "Overwrite JVM Settings" . You should not have this activated.
In case that you use HTTP - Bypass Proxy Servers
Make sure that you enter not only the domain (*.sap.com), but you have to enter all subdomains.
Regards,
Kai