nnimap authentication prompts?

[Simon Josefsson <simon@josefsson.org>]

I am upgrading from a rather old Gnus release, and it works relatively
well so far after I removed all nnir hooks in ~/.emacs.  I have this
gnus-secondary-select-method:

 (nnimap "yxa"
	 (nnimap-stream starttls)
	 (nnimap-address "localhost")
	 (nnimap-server-port 1430))

and a line in ~/.authinfo for this:

machine localhost port 1430 login jas password foo

however when I start Gnus it asks me a series of questions that confuses
me.  The first one is hostname, and I can chose between yxa and
localhost, what does this mean?  The username and password prompts are
understandable (although shouldn't it read this from my .authinfo
file?).  The final prompt is for port and I cannot specify 1430, only
'143' and 'imap' are valid choices.  I just pressed enter and it worked
anyway.

Should I modify my gnus-secondary-select-method to avoid these prompts?
If so to what?

Thanks,
/Simon