<pre>I have a machine with the follow specs.<br /><br />Linux hermes.business.com 2.6.11-1.1369_FC4 #1 Thu Jun 2 22:55:56 EDT 2005<br />i686 i686 i386 GNU/Linux<br /><br />pam-0.79-8<br />dovecot-0.99.14-4.fc4<br /><br />No one is able to receive e-mails due to authentication failures and yesterday afternoon<br />they were able to.<br /><br />I tried the following command directly from the server and got the following results:<br /><br />[root@hermes log]# telnet localhost 110<br />Trying 127.0.0.1...<br />Connected to localhost.localdomain (127.0.0.1).<br />Escape character is '^]'.<br />+OK dovecot ready.<br />USER user1<br />+OK<br />PASS ****************<br />-ERR Authentication failed.<br /><br />I checked the /var/log/messages file and saw the following:<br /><br />Jan 12 11:25:41 hermes unix_chkpwd[4601]: check pass; user unknown<br />Jan 12 11:25:41 hermes dovecot(pam_unix)[4600]: authentication failure; logname=<br />uid=0 euid=0 tty= ruser= rhost= user=[user2]<br />Jan 12 11:33:50 hermes unix_chkpwd[4718]: check pass; user unknown<br />Jan 12 11:33:50 hermes dovecot(pam_unix)[4717]: authentication failure; logname=<br />uid=0 euid=0 tty= ruser= rhost= user=[user1]<br /><br />Here is my /etc/pam.d/dovecot file<br /><br />#%PAM-1.0<br />auth required pam_nologin.so<br />auth required pam_stack.so service=system-auth<br />account required pam_stack.so service=system-auth<br />session required pam_stack.so service=system-auth<br /><br />Any suggestions where to look to resolve the authentication issue?<br /><br />Thanks,<br /><br />David Kolts</pre><BR>