[ilovejedd]

From the FAQ:

How do I get calibre to use my HTTP proxy?

By default, calibre uses whatever proxy settings are set in your OS. Sometimes these are incorrect, for example, on windows if you don’t use Internet Explorer then the proxy settings may not be up to date. You can tell calibre to use a particular proxy server by setting the http_proxy environment variable. The format of the variable is: http://username:password@servername you should ask your network admin to give you the correct value for this variable. Note that calibre only supports HTTP proxies not SOCKS proxies. You can see the current proxies used by calibre in Preferences->Miscellaneous.