permission problem on lmtp socket

[JOYDEEP]

Dear list,

I have    "mailbox_transport = lmtp:unix:/var/lib/imap/socket/lmtp"  in
main.cf

I have "lmtpunix      cmd="lmtpd" listen="/var/lib/imap/socket/lmtp" prefork=1"
in cyrus.conf


now when ever I try to sent mail from user at mydomain.com   to
user at mydomain.com
it reports error
-------------------------------
Apr 27 11:31:25 lvps87-230-8-228 postfix/lmtp[3433]: 2BF37BFE10C:
to=<test at opendingo.com>, relay=none, delay=2822, status=deferred
(connect to /var/lib/imap/socket/lmtp[/var/lib/imap/socket/lmtp]:
Permission denied)
------------------------------------------

I have checked the permission and it is own by cyrus mail
I have also checked the parent path starting from /var/lib/imap and it
alongwith the underlying structures are owned by cyrus:mail

more over lmtptest command reports
----------------------------------
getaddrinfo: Servname not supported for ai_socktype
failure: Network initialization - can not connect to localhost:lmtp
--------------------------------
I am using suse 9.2.  How can I solve it ? please help