ZM_MIN_STREAMING_PORT under proxy, server URL becomes IP address

[koptermax]

• ZoneMinder 1.34.26 from PPA
• Ubuntu 20.04
• Chrome 94
• nginx proxy

Nginx has listen rule to _webdnsname:ports that leads to _proxypass to _zmserver_ip:$zmserverport All works fine if I don't use multiport streaming.

Setting ZM_MIN_STREAMING_PORT and configuring the relative ports on NGINX proxy_pass, all works fine using local DNS-provided servername in my LAN.

But for some reason, when querying the server by the _webdnsname that nginx listens to and proxies, the URL of the monitors that ZoneMinder generates and tries to query, are no longer in the form of _https://dns_name:port/zm_, but they become _https://local_lan_server_ip:port/zm_

This obviously breaks monitors when connecting from outside the LAN.

See:

• what should be this: _https://webdns_name:30006/zm/cgi-bin/nph-zms?width=100%&height=auto&mode=jpeg&......_
• becomes this: https://192.168.1.10:30006/zm/cgi-bin/nph-zms?width=100%&height=auto&mode=jpeg&......

Any clue what could be wrong in the code?

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