Hi, I am in the process of setting up replication. I have setup the replica server and I have tested it successfully with sync_test. -sh-3.2$ synctest -u cyrus -w password -t "" replica S: * STARTTLS S: * OK imap2.mediassistindia.com Cyrus sync server v2.3.7-Invoca-RPM-2.3.7-2.el5 C: STARTTLS S: OK Begin TLS negotiation now verify error:num=18:self signed certificate TLS connection established: TLSv1 with cipher AES256-SHA (256/256 bits) S: * SASL PLAIN S: * OK imap2.mediassistindia.com Cyrus sync server v2.3.7-Invoca-RPM-2.3.7-2.el5 C: AUTHENTICATE PLAIN **** S: OK Success (tls protection) Authenticated. Security strength factor: 256 However, when I try to use sync_client to replicate a mailbox I get the following error, -sh-3.2$ /usr/lib/cyrus-imapd/sync_client -vl -u yukthi Can not connect to server 'replica', retrying in 15 seconds and this in syslog, Aug 20 12:18:39 imap1 sync_client[10378]: connect(replica) failed: Invalid argument I ran tcpdump on the replica server and I don't see any packets coming to port 'csync'. You can also find the strace output of sync_client at http://sultanpur.org/sync_client_strace. Master server's imapd.conf: configdirectory: /var/lib/imap partition-default: /var/spool/imap admins: cyrus sievedir: /var/lib/imap/sieve sendmail: /usr/sbin/sendmail hashimapspool: true sasl_pwcheck_method: saslauthd sasl_mech_list: PLAIN lmtp_downcase_rcpt: 1 allowplaintext: 1 tls_cert_file: /etc/pki/cyrus-imapd/cyrus-imapd.pem tls_key_file: /etc/pki/cyrus-imapd/cyrus-imapd.pem tls_ca_file: /etc/pki/tls/certs/ca-bundle.crt autocreatequota: 2048000 unixhierarchysep: 1 sync_host: replica sync_authname: cyrus sync_password: password Cyrus version: 2.3.7 on Cent OS 5.2 -Avinash ---- Cyrus Home Page: http://cyrusimap.web.cmu.edu/ Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html