gnus-default-nntp-server

gnus-default-nntp-server is a variable defined in `gnus.el'.
Its value is

nil

Documentation:
The hostname of the default NNTP server.
The empty string, or nil, means to use the local host.
You may wish to set this on a site-wide basis.

If you want to change servers, you should use `gnus-select-method'.

You can customize this variable.