ssh gives "Permission denied, please try again"

I have 3 machines on my home network and I can ssh to them, back and
forth, without problems. I can also ssh to localhost without problems.
But I can't ssh to ac@xxxxxxxxxxxxxxxxx I get "Permission denied, please
try again", and at the third attempt I get "Permission denied,
publickey,password)".

I'm trying this because I shall be going abroad later and want to ssh to
my machine at home to read mail.

Googling shows a number of people with similar problems but no solutions
for me. Some suggest changing the permissions of /dev/tty*, but I'm
reluctant to do this and in any case the changes would not survive a
reboot.

Any suggestions please?

--
Anthony Campbell - ac@xxxxxxxxxxxxxxxx
Microsoft-free zone - Using Debian GNU/Linux
http://www.acampbell.org.uk (blog, book reviews,
and sceptical articles)

.

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