Sudenly unable to backup from database

Using pgAdmin 1.14.1, earlier this morning I did a backup of a single table
from my database in plain format, which completed successfully. I now try to
repeat that operation and it fails. Here are the messages from the attempt:

/Applications/pgAdmin3.app/Contents/SharedSupport/pg_dump --host
ec2-54-197-246-17.compute-1.amazonaws.com --port 5562 --username
"u6u1m6ai8tdviu" --no-password --format tar --section data --no-privileges
--verbose --file "/Users/jackrg/Documents/heroku-partial-for-just-logs.dump"
--table "public.logs" "d4n5qjtiqnucn2"
pg_dump: [archiver (db)] connection to database "d4n5qjtiqnucn2" failed:
FATAL: password authentication failed for user "u6u1m6ai8tdviu"
FATAL: no pg_hba.conf entry for host "72.219.168.82", user
"u6u1m6ai8tdviu", database "d4n5qjtiqnucn2", SSL off

Process returned exit code 1.

The problem is (apparently) the "--no-password" command-line switch. Why is
that switch there (the database is password-protected and the password is on
file, since I can connect to the database). FWIW, this Postgres database is
hosted on Heroku.

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