Sync'ing two dovecot servers

Greetings,

I was pleased to see that dovecot has a sync function in doveadm. So 
far, other tools for moving mailbox contents from one server to another 
has not been successful.

However.

Perhaps I don't understand how this should work.  I have a new 
containerized dovecot v2.4.2

    # 2.4.2 (0962ed2104): /etc/dovecot/dovecot.conf
    # OS: Linux 6.12.63+deb13-amd64 x86_64

and I have an existing dovecot running in a VPS:

    # 2.3.19.1 (9b53102964): /etc/dovecot/dovecot.conf
    # Pigeonhole version 0.5.19 (4eae2f79)
    # OS: Linux 6.1.0-35-amd64 x86_64 Debian 12.11

I want to move one user, as a test.  I execute this in the container.

    # doveadm sync  -R1 -u USER tcps:OLD_SERVER:993
    doveadm(USER): Error: conn OLD_SERVER:993 (IP:993): doveadm server
    sent invalid handshake: * OK [CAPABILITY IMAP4rev1 SASL-IR
    LOGIN-REFERRALS ID ENABLE IDLE LITERAL+ AUTH=PLAIN AUTH=LOGIN]
    Dovecot (Debian) ready.
    doveadm(USER): Error: cmd sync: Disconnected from remote: Connection
    closed

I'm pretty sure that doveadm sync was able to negotiate the TLS 
connection.  I don't see what it could object to in the sign-on. What am 
I missing?

Cheers

-- 
/Marc Oscar Singer/
*Woollysoft*
Dial 817.1823.602.1+ from right to left.

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