Zimbra unstable after rsync migration

[apiening]

Hi there,
since my server has being compromised by CVE-2019-9670, I did an upgrade to 8.8.12.GA.3794 and migrated my mail server to another server with a clean install with the same version based on this guide: https://wiki.zimbra.com/wiki/Steps_To_R ... ion_steps_:

I followed the "rsync migration steps" and ended up with a working installation: I can send and receive emails, create new accounts etc.
However, I noticed after a few hours the service status in the administration panel marked several services as failed (see https://imgur.com/a/eqXux0M).
I also checked the status with `zmcontrol status` but everything looked fine:

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	amavis                  Running
	antispam                Running
	antivirus               Running
	dnscache                Running
	ldap                    Running
	logger                  Running
	mailbox                 Running
	memcached               Running
	mta                     Running
	opendkim                Running
	proxy                   Running
	service webapp          Running
	snmp                    Running
	spell                   Running
	stats                   Running
	zimbra webapp           Running
	zimbraAdmin webapp      Running
	zimlet webapp           Running
	zmconfigd               Running

The mail server was fully functional at this point in time. Sending, receiving and using the web interface went flawlessly.
Several hours later the mail system stopped working. Even connecting via IMAP failed.

In my `/var/log/mail.err` I can see several errors:

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zmmailboxdmgr[30347]: no manager process is running
postfix/postqueue[31394]: fatal: Queue report unavailable - mail system is down
zmmailboxdmgr[32064]: no manager process is running
zmmailboxdmgr[32106]: no manager process is running
zmmailboxdmgr[32193]: no manager process is running
zmmailboxdmgr[32210]: no manager process is running
zmmailboxdmgr[32227]: no manager process is running
zmmailboxdmgr[32606]: no manager process is running
zmmailboxdmgr[4803]: manager process 32618 could not died in 60 seconds
zmmailboxdmgr[5313]: no manager process is running
zmmailboxdmgr[5337]: no manager process is running

(I removed the timestamp and host from the log entries)

After a `zmcontrol restart` everything is working again. But I need to do this 1-2 times a day when I notice that the email system is down again.

Even though I tried to follow the guide as strict as possible, I can't eliminate the chance that I did missed something since the guide says 'Change any other settings on the new server to match the configuration on the original server.' and there are a lot of options.

Did anyone run into similar issues or can someone give me a hint how I can track this error?

Kind regards

Andreas