How do I set a system wide proxy with a username and password?

Solution 1:

Try escaping the backslash like this:

http://user%5Cname:[email protected]:8080/

where '%5C' is the URL-encoded value for the backslash character. See this background.

Solution 2:

Historically, you could set up a proxy using environment variables like http_proxy=http://USERNAME:PASSWORD@PROXYIP:PROXYPORT

So it might be possible to specify the username and password in the host field of the Network section like above, i.e. myuser:[email protected]