[Dovecot] Help With 'No SASL Authentication Mechanisms' Error

[research at the10thfloor.com]

Hi,

I'm trying to configure a new server with dovecot 2.0 and postfix 2.6.6. 
My previous servers have all been dovecot 1.x. Trying to port over my
previous configurations has been a real headache.

Currently, I'm getting the following errors when trying to connect with:
openssl s_client -starttls smtp -connect localhost:25

Aug 21 19:08:46 localhost postfix/smtpd[26252]: connect from localhost[::1]
Aug 21 19:08:46 localhost postfix/smtpd[26252]: warning: SASL: Connect to
private/auth failed: Permission denied
Aug 21 19:08:46 localhost postfix/smtpd[26252]: fatal: no SASL
authentication mechanisms
Aug 21 19:08:47 localhost postfix/master[26226]: warning: process
/usr/libexec/postfix/smtpd pid 26252 exit status 1
Aug 21 19:08:47 localhost postfix/master[26226]: warning:
/usr/libexec/postfix/smtpd: bad command startup -- throttling

If someone could help me out I'd really appreciate it.  My Dovecot and
Postfix configuration changes are below...

Thanks,

slevytam

---------------------------------------------------------------------------

DOVECOT:
# 2.0.beta6 (3156315704ef): /etc/dovecot/dovecot.conf
# OS: Linux 2.6.32-71.29.1.el6.x86_64 x86_64 CentOS Linux release 6.0 (Final)
auth_debug = yes
auth_verbose = yes
mail_location = maildir:~/Maildir
mbox_write_locks = fcntl
passdb {
  args = username_format=%u /etc/dovecot/passwd
  driver = passwd-file
}
protocols = imap lmtp
service auth {
  unix_listener /var/spool/postfix/private/auth {
    group = postfix
    mode = 0600
    user = postfix
  }
}
service imap-login {
  inet_listener imap {
    port = 143
  }
  inet_listener imaps {
    port = 993
    ssl = yes
  }
}
ssl_cert = </etc/pki/tls/certs/mail_the10thfloor_com.crt
ssl_cipher_list = ALL:!LOW:!SSLv2
ssl_key = </etc/pki/tls/private/mail_the10thfloor_com-nopass.key
userdb {
  args = username_format=%u /etc/dovecot/passwd
  driver = passwd-file
}
verbose_proctitle = yes
verbose_ssl = yes


POSTFIX:
alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
broken_sasl_auth_clients = yes
command_directory = /usr/sbin
config_directory = /etc/postfix
daemon_directory = /usr/libexec/postfix
data_directory = /var/lib/postfix
debug_peer_level = 2
html_directory = no
inet_interfaces = localhost
inet_protocols = all
mail_owner = postfix
mailq_path = /usr/bin/mailq.postfix
manpage_directory = /usr/share/man
mydestination = localhost
mydomain = the10thfloor.com
myhostname = mail.the10thfloor.com
myorigin = $mydomain
newaliases_path = /usr/bin/newaliases.postfix
queue_directory = /var/spool/postfix
readme_directory = /usr/share/doc/postfix-2.6.6/README_FILES
sample_directory = /usr/share/doc/postfix-2.6.6/samples
sendmail_path = /usr/sbin/sendmail.postfix
setgid_group = postdrop
smtpd_recipient_restrictions = permit_mynetworks,
permit_sasl_authenticated, reject_unauth_destination
smtpd_sasl_auth_enable = yes
smtpd_sasl_path = private/auth
smtpd_sasl_security_options = noanonymous
smtpd_sasl_type = dovecot
smtpd_tls_auth_only = yes
smtpd_tls_cert_file = /etc/pki/tls/certs/mail_the10thfloor_com.crt
smtpd_tls_key_file = /etc/pki/tls/private/mail_the10thfloor_com-nopass.key
smtpd_tls_security_level = may
soft_bounce = no
tls_random_source = dev:/dev/urandom
unknown_local_recipient_reject_code = 550
virtual_gid_maps = static:502
virtual_mailbox_base = /home/vmail/
virtual_mailbox_domains = the10thfloor.com
virtual_mailbox_maps = hash:/etc/postfix/vmailbox
virtual_uid_maps = static:502