> What could be the cause, that for some things the Internet is available > for the guest and for other things the Internet isn't available. > > Safari's German message says that it can't connect to > https://startpage.com/ , because it can't establish a secure connection. "can't establish a secure connection" could mean a DNS or hostname lookup failure, a TCP connect failure, or perhaps some sort of SSL certificate problem. To figure out where the problem is, try connecting with ping & telnet from a DOS cmd prompt, using both hostnames and IP addresses (telnet to port 443 for https), and try a different browser. As always when debugging Windows, it doesn't hurt to scan for malware, e.g. run Malwarebytes Carl
