Proxy issue - how to verify proxy function on single-server install, after modifications?

[bisi]

I have a single-server install of zimbra 8.7.11 FOSS on which I have renamed the host.

it was mail2.domain.tld

it is now mail.domain.tld

Everything seems to be working correctly, BUT one of the tests in the guiding document, https://wiki.zimbra.com/wiki/ZmSetServerName, returned an incorrect result that took a lot of poking about to fix, namely:

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zimbra@mail:~$ zmprov gacf | grep -i ReverseProxyUpstreamLoginServers
zimbraReverseProxyUpstreamLoginServers: mail2.domain.tld

I eventually figured out that I need to issue:

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zimbra@mail:~$ zmprov mcf zimbraReverseProxyUpstreamLoginServers mail.domain.tld

but along the way I also issued this command (cribbed from https://wiki.zimbra.com/wiki/Enabling_Z ... leshooting ):

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zmprov ms mail2.domain.tld zimbraReverseProxyLookupTarget FALSE

It was the recommended action for the situation "If a non-mailbox server is listed, set the zimbraReverseProxyLookupTarget server configuration attribute to FALSE for that server."

This is the current value of the setting (I think it's the one I (?) mistakenly set).

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zimbra@mail:~$ zmprov gcf zimbraReverseProxyLookupTarget
zimbraReverseProxyLookupTarget: FALSE

BTW, the troubleshooting step that led me to issue the command in question now shows:

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zimbra@mail:~$ grep zm_lookup_handlers /opt/zimbra/conf/nginx/includes/nginx.conf.zmlookup
    zm_lookup_handlers  https://192.168.42.6:7072/service/extension/nginx-lookup;

This is the IP address of the single-server zimbra install.

So, my question is, how do I verify the proxying settings are correct?

From the same wiki page describing how to deploy proxy and memcached in existing non-proxy environments

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zimbra@mail:~$ lsof -i :443
COMMAND   PID   USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
nginx   24214 zimbra   10u  IPv4 245767      0t0  TCP *:https (LISTEN)
nginx   24215 zimbra   10u  IPv4 245767      0t0  TCP *:https (LISTEN)
nginx   24216 zimbra   10u  IPv4 245767      0t0  TCP *:https (LISTEN)
nginx   24216 zimbra   22u  IPv4 290743      0t0  TCP mail.domain.tld:https->S01066038e0077acb.gv.shawcable.net:60044 (ESTABLISHED)
nginx   24217 zimbra   10u  IPv4 245767      0t0  TCP *:https (LISTEN)

Thanks in advance