dsync connection issue

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I'm trying to move from my exising server to a new site. In preparation 
for this I've set up the new server as per the first attachment.

I've added additional (temporary) setting to the new site as per these 
instructions

https://wiki2.dovecot.org/Migration/Dsync

but when I try to do a backup with the following command from the old to 
the new site

sudo doveadm -D -o imapc_user=user1 at oldserver  -o 
imapc_password=pw-oldserver backup -R -u user1 at newserver imapc:

I get

-----------------------
Error: User initialization failed: imapc: Login to 'oldserver' failed: 
Disconnected from server

----------------------

I can connect to both sites without any issues

openssl s_client -crlf -connect newserver:993

openssl s_client -crlf -connect oldserver:993


Not sure what I'm missing.

Have also included the config for the old site

Thanks,

Leo


-------------- next part --------------
llist at listsInWien:~$ dovecot -n
# 2.2.33.2 (d6601f4ec): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.4.21 (92477967)
# OS: Linux 4.15.0-43-generic x86_64 Ubuntu 18.04.1 LTS ext4
auth_debug = yes
auth_mechanisms = plain login cram-md5
dsync_features = empty-header-workaround
imapc_features = rfc822.size fetch-headers
imapc_host = llmail.zudiewiener.com
imapc_list_prefix = INBOX
imapc_port = 993
imapc_user = %u
log_path = /var/log/dovecot.log
mail_debug = yes
mail_gid = vmail
mail_location = maildir:/home/vmail/mailboxes/%d/%n
mail_prefetch_count = 20
mail_privileged_group = vmail
mail_uid = vmail
managesieve_notify_capability = mailto
managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date index ihave duplicate mime foreverypart extracttext imapsieve vnd.dovecot.imapsieve
namespace inbox {
  inbox = yes
  location = 
  mailbox Drafts {
    special_use = \Drafts
  }
  mailbox Junk {
    special_use = \Junk
  }
  mailbox Sent {
    auto = subscribe
    special_use = \Sent
  }
  mailbox "Sent Messages" {
    special_use = \Sent
  }
  mailbox Spam {
    auto = subscribe
    special_use = \Junk
  }
  mailbox Trash {
    auto = subscribe
    special_use = \Trash
  }
  prefix = 
}
passdb {
  driver = pam
}
passdb {
  args = /etc/dovecot/dovecot-sql.conf.ext
  driver = sql
}
plugin {
  imapsieve_mailbox1_before = file:/home/vmail/sieve/global/learn-spam.sieve
  imapsieve_mailbox1_causes = COPY
  imapsieve_mailbox1_name = Spam
  imapsieve_mailbox2_before = file:/home/vmail/sieve/global/learn-ham.sieve
  imapsieve_mailbox2_causes = COPY
  imapsieve_mailbox2_from = Spam
  imapsieve_mailbox2_name = *
  sieve = file:/home/vmail/sieve/%d/%n/scripts;active=/home/vmail/sieve/%d/%n/active-script.sieve
  sieve_before = /home/vmail/sieve/global/spam-global.sieve
  sieve_global_extensions = +vnd.dovecot.pipe
  sieve_pipe_bin_dir = /usr/bin
  sieve_plugins = sieve_imapsieve sieve_extprograms
}
protocols = imap lmtp sieve
service auth {
  unix_listener /var/spool/postfix/private/auth {
    group = postfix
    mode = 0660
    user = postfix
  }
  unix_listener auth-userdb {
    group = vmail
    mode = 0660
    user = vmail
  }
}
service imap-login {
  inet_listener imap {
    port = 143
  }
}
service lmtp {
  unix_listener /var/spool/postfix/private/dovecot-lmtp {
    group = postfix
    mode = 0660
    user = postfix
  }
  user = vmail
}
service managesieve-login {
  inet_listener sieve {
    port = 4190
  }
}
ssl_cert = </etc/letsencrypt/live/zudiewiener.com/fullchain.pem
ssl_cipher_list = EDH+CAMELLIA:EDH+aRSA:EECDH+aRSA+AESGCM:EECDH+aRSA+SHA256:EECDH:+CAMELLIA128:+AES128:+SSLv3:!aNULL:!eNULL:!LOW:!3DES:!MD5:!EXP:!PSK:!DSS:!RC4:!SEED:!IDEA:!ECDSA:kEDH:CAMELLIA128-SHA:AES128-SHA
ssl_client_ca_dir = /etc/ssl
ssl_key =  # hidden, use -P to show it
ssl_prefer_server_ciphers = yes
userdb {
  driver = passwd
}
userdb {
  args = /etc/dovecot/dovecot-sql.conf.ext
  driver = sql
}
protocol lmtp {
  mail_plugins = " sieve"
  postmaster_address = postmaster at mail2.zudiewiener.com
}
protocol imap {
  imap_idle_notify_interval = 29 mins
  mail_max_userip_connections = 20
  mail_plugins = " quota imap_quota imap_sieve notify replication"
}

-------------- next part --------------
adovecot -n
# 2.2.33.2 (d6601f4ec): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.4.21 (92477967)
# OS: Linux 4.15.0-43-generic x86_64 Ubuntu 18.04.1 LTS ext4
auth_debug_passwords = yes
auth_mechanisms = plain cram-md5
auth_verbose = yes
info_log_path = /var/log/dovecot.info
log_path = /var/log/dovecot.log
mail_location = maildir:/home/vmail/%d/%n
namespace {
  inbox = yes
  location = 
  prefix = INBOX.
  separator = .
}
namespace inbox {
  location = 
  mailbox Drafts {
    special_use = \Drafts
  }
  mailbox Junk {
    special_use = \Junk
  }
  mailbox Sent {
    special_use = \Sent
  }
  mailbox "Sent Messages" {
    special_use = \Sent
  }
  mailbox Trash {
    special_use = \Trash
  }
  prefix = 
}
passdb {
  args = /etc/dovecot/passwd
  driver = passwd-file
}
protocols = imap
service auth {
  unix_listener /var/spool/postfix/private/auth {
    group = postfix
    mode = 0660
    user = postfix
  }
}
service imap-login {
  chroot = login
  executable = /usr/lib/dovecot/imap-login
  user = dovecot
}
service pop3-login {
  chroot = login
  executable = /usr/lib/dovecot/pop3-login
  user = dovecot
}
ssl_cert = </etc/ssl/certs/ssl-cert-snakeoil.pem
ssl_key =  # hidden, use -P to show it
userdb {
  driver = prefetch
}
userdb {
  args = /etc/dovecot/users
  driver = passwd-file
}
protocol imap {
  mail_max_userip_connections = 40
}
llist at llmail:~$