Hi,

I am trying to establish TCP(s)-based replication between two FreeBSD 11.1 machines, both running Dovecot 2.2.35 (via pkg) with 10 virtual users and 1.2GB maildir. I followed the Wiki description (https://wiki2.dovecot.org/Replication), just skipped the SSH part. My resulting configurations are attached below.

Problem: After reloading both Dovecot instances, a few seconds later they start to initiate connections in an absurdly high rate (30-50 new connections during 10 secs, closing old ones after 2-3 secs) and even after 1 hour they do not „calm down". E-mails are copied, but judging by size and file count, not completely (approx. 1GB and maybe 90% of files are getting synced). What is going on here?

On the destination host (with empty storage before replication) I see "incremental - Waiting for dsync to finish“ in dsync-status, constantly flipping between handshake and waiting, for solely 4 out of 10 accounts. Replicator status says 0 requests and 10 total users.

On the source host, replicator status says 4 queued full resyncs, 3 waiting failed and 10 total users.

I already tried both tcps and tcp; activating debug log did not reveal any errors (e.g. SSL). Would be happy for any advice to track this down.

Best regards, tok

Config source host:

# 2.2.35 (b1cb664): /usr/local/etc/dovecot/dovecot.conf # Pigeonhole version 0.4.23 (b2e41927) # OS: FreeBSD 11.1-RELEASE-p10 amd64 zfs # Hostname: srv1.TLD auth_mechanisms = plain login doveadm_password = # hidden, use -P to show it doveadm_port = 12345 lmtp_save_to_detail_mailbox = yes login_trusted_networks = 172.16.1.110/32 mail_location = maildir:/srv/mail/vhosts/%d/%n mail_plugins = quota mailbox_alias notify replication

namespace inbox { […] } passdb { args = scheme=CRYPT username_format=%u /usr/local/etc/dovecot/users driver = passwd-file } plugin { mail_replica = tcps:srv2.TLD:12345 quota = maildir:User quota quota_grace = 10%% quota_max_mail_size = 50M quota_rule = *:storage=1G quota_rule2 = Trash:storage=+10%% quota_rule3 = Junk:storage=+20%% quota_status_nouser = DUNNO quota_status_overquota = 552 5.2.2 Mailbox is over quota / full quota_status_success = DUNNO quota_warning = storage=95%% quota-warning 95 %u quota_warning2 = storage=80%% quota-warning 80 %u quota_warning3 = -storage=100%% quota-warning below %u [...] } postmaster_address = postmaster@TLD quota_full_tempfail = yes service aggregator { fifo_listener replication-notify-fifo { mode = 0666 user = vmail } unix_listener replication-notify { mode = 0666 user = vmail } } service auth-worker { user = $default_internal_user } service auth { unix_listener /var/spool/postfix/private/auth { group = postfix mode = 0660 user = postfix } } service config { unix_listener config { user = vmail } } service doveadm { inet_listener { port = 12345 ssl = yes } } service imap-login { process_min_avail = 1 service_count = 1 } service lmtp { unix_listener /var/spool/postfix/private/dovecot-lmtp { group = postfix mode = 0600 user = postfix } } service pop3-login { process_min_avail = 1 service_count = 1 } service quota-status { client_limit = 1 executable = quota-status -p postfix inet_listener { address = 127.0.0.1 port = 12340 } } service quota-warning { executable = script /usr/local/bin/dovecot-quota-warning.sh user = vmail } service replicator { process_min_avail = 1 unix_listener replicator-doveadm { group = vmail mode = 0666 } } ssl_cert =

Diff config of destination host:

4c4 < # Hostname: srv2.TLD

# Hostname: srv1.TLD 9a10 login_trusted_networks = 172.16.1.110/32 60c61 < mail_replica = tcps:srv1.TLD:12345

mail_replica = tcps:srv2.TLD:12345 156c157 < ssl_cert =

ssl_cert =