Error: conn unix:/run/dovecot/stats-writer : Timeout waiting for handshake response

[filipe at digirati.com.br]

Hi, I'm using ubuntu 22.04 and installed dovecot 2.3.16.

I did some initial testing with 100 email accounts and everything seemed 
to work perfectly the same as dovecot version 2.3.16 on another server.
So I performed the migration of approximately 30 thousand email 
accounts, but the following error started to appear and I know well what 
to do:

    Jul 14 18:55:29 box5 dovecot: pop3: Error: conn
    unix:/run/dovecot/stats-writer (pid=3733995,uid=0): Timeout waiting
    for handshake response
    Jul 14 18:55:29 box5 dovecot: imap: Error: conn
    unix:/run/dovecot/stats-writer (pid=3733995,uid=0): Timeout waiting
    for handshake response
    Jul 14 18:55:29 box5 dovecot: managesieve: Error: conn
    unix:/run/dovecot/stats-writer (pid=3733995,uid=0): Timeout waiting
    for handshake response
    Jul 14 18:55:29 box5 dovecot: lmtp: Error: conn
    unix:/run/dovecot/stats-writer (pid=3733995,uid=0): Timeout waiting
    for handshake response
    Jul 14 18:55:29 box5 dovecot: imap-login: Error: conn
    unix:/run/dovecot/stats-writer (pid=3733995,uid=0): Timeout waiting
    for handshake response
    Jul 14 18:55:29 box5 dovecot: imap: Error: conn
    unix:/run/dovecot/stats-writer (pid=3733995,uid=0): Timeout waiting
    for handshake response
    Jul 14 18:55:29 box5 dovecot: imap-login: Error: conn
    unix:/run/dovecot/stats-writer (pid=3733995,uid=0): Timeout waiting
    for handshake response
    Jul 14 18:55:29 box5 dovecot: message repeated 3 times: [
    imap-login: Error: conn unix:/run/dovecot/stats-writer
    (pid=3733995,uid=0): Timeout waiting for handshake response]
    Jul 14 18:55:29 box5 dovecot: imap: Error: conn
    unix:/run/dovecot/stats-writer (pid=3733995,uid=0): Timeout waiting
    for handshake response
    Jul 14 18:55:29 box5 dovecot: message repeated 2 times: [ imap:
    Error: conn unix:/run/dovecot/stats-writer (pid=3733995,uid=0):
    Timeout waiting for handshake response]

Permissions on files

    79411 srw------- 1 root    root       0 Jul 14 18:55 stats-reader
    79412 srw-rw---- 1 root    dovecot    0 Jul 14 18:55 stats-writer


Does anyone know anything about this problem that can help me?
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