Fedora Core 2 Dovecot pop3 Server - Cannot retrieve mail at XP client using Outlook Express 6

I have sendmail set up properly since I can recieve mail from the internet.  When I try to get the email from a Windows XP client, I get the following message.

Your server has unexpectedly terminated the connection. Possible causes for this include server problems, network problems, or a long period of inactivity. Account: 'bti-web', Server: '192.168.1.4', Protocol: POP3, Port: 110, Secure(SSL): No, Error Number: 0x800CCC0F

I would like help troubleshooting this issue.  Where do I look to on the Fedora Server to see why the Server "terminated the connection". I have googled this and found lots of comments like Dovecot is easy to set up but inadequate instructions explaining what parameters are required for pop3.  

If anyone has a Dovecot.conf file that works for retrieving mail using pop3 protocol that would help also. This my dovecot.conf

base_dir = /var/run/dovecot/
protocols = pop3
pop3_listen = *:110
ssl_disable = yes
disable_plaintext_auth = no
login_dir = /var/run/dovecot/login
first_valid_uid = 500
last_valid_uid = 500
default_mail_env = maildir:/var/mail/%1u/%u/Maildir

I have been trying to get mail with user account UID 500

I was able to get imap to work but not pop3.

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