[exim] dovecot_plain authenticator

Hi All,

I'm trying to use the dovecot_plain authenticator example from the
manual to do authentication for my exim 4.68 install. I modified the
server_socket directive to point at "/var/run/dovecot/auth-worker.^\\d
+\$"

I'm getting the error message: "dovecot_plain authenticator failed
for fake.workstation.utoronto.ca [192.168.1.1]:62532 I=[192.168.1.2]:
587: 435 Unable to authenticate at present: authentication socket
connection error"

For giggles I changed the socket directive to point at the actual
socket "/var/run/dovecot/auth-worker.9898" that was active on the
dovecot server and got the same error message.

Hopped on the dovecot server (which is running on the same physical
machine as exim) and set "disable_plaintext_auth = no" in
dovecot.conf . Same error.

Then I just got plain silly and shut down dovecot and tried
authenticating my smtp session through it and...I got the same error
message. There is nothing showing up in dovecots log's.

Any suggestions on what to examine further?