If you use a proxy server, please put a check-mark next to Use proxy server. You should only change these settings if your virus signature update is not working. If necessary, consult your system administrator or Internet service provider about the proxy address. If necessary you can also enter the access data for the proxy server here.
Proxy server: A proxy server consolidates all requests to networks and distributes them to computers connected to it. If for example you use your computer in a company network, it may be useful for you to connect to the net via a proxy server. In the event of problems with the virus signature update you should generally first check to see if you can access the Internet at all via a web browser. If you cannot connect to the Internet at all, the problem probably lies with your Internet connection and not with the proxy server data.