login failed in cyradm

[Ramprasad A Padmanabhan]

I just installed cyrus 2.1.13  on redhat 9.0 linux
I am using saslauthd and backend pam ldap to authenticate

After making the configuration in /etc/imapd.conf and /etc/ldap.conf and
/etc/pamd
I am able to login to the imap server by using raw telnet commands

telnet localhost 143
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
* OK mail2.netcore.co.in Cyrus IMAP4 v2.1.13 server ready
a1 login cyrus mypassword
a1 OK User logged in


But when I use cyradm I get authentication failed.
And in syslog an error like
perl: no worthy mechs found


then I changed the system password of cyrus to the same as the ldap one
Now it works
Meaning cyradm uses system-auth for authentication.
my /etc/pam.d/imap looks like this

auth       sufficient   /lib/security/pam_ldap.so
account    sufficient   /lib/security/pam_ldap.so


Can anyone help me understand  why cyradm uses system-auth as the
mechanism 

Thanks
Ram



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