144: Why doesn't Gnus work via NNTP?
There is a bug in NNTP version 1.5.10, such that when multiple requests
are sent to the NNTP server, the server only handles the first one before
blocking waiting for more input which never comes. NNTP version 1.5.11
claims to fix this.
You can work around the bug inside Emacs like this:
(setq nntp-maximum-request 1)
You can find out what version of NNTP your news server is running by
telnetting to the NNTP port (usually 119) on the news server machine
(i.e., "telnet server-machine 119"). The server should give its version
number in the welcome message. Type "quit" to get out.