Apache2 Error AH01753 unable to get the remote host name, nextcloudpi

Ich bekomme diese Fehlermeldung nicht weg auf meinem nextcloudpi!
Habe die Datenbank von der externen USB-Platte zurück auf die SD geschoben, was leider nicht die Lösung war.

Hier die Meldung des Apache2 Error.log:

[Sat Feb 23 12:37:28.599573 2019] [authz_host:error] [pid 15938:tid 2790691872] [client 192.168.178.100:54980] AH01753: access check of ‘localhost’ to /ncp-launcher.php failed, reason: unable to get the remote host name
[Sat Feb 23 12:37:30.937639 2019] [proxy_fcgi:error] [pid 15938:tid 2807493664] [client 192.168.178.100:54980] AH01067: Failed to read FastCGI header
[Sat Feb 23 12:37:30.937807 2019] [proxy_fcgi:error] [pid 15938:tid 2807493664] (104)Connection reset by peer: [client 192.168.178.100:54980] AH01075: Error dispatching request to :4443:
[Sat Feb 23 12:37:31.173101 2019] [mpm_event:notice] [pid 1329:tid 3069193488] AH00491: caught SIGTERM, shutting down
[Sat Feb 23 12:38:10.974572 2019] [ssl:warn] [pid 1093:tid 3070172432] AH01909: localhost:4443:0 server certificate does NOT include an ID which matches the server name
[Sat Feb 23 12:38:11.046109 2019] [ssl:warn] [pid 1288:tid 3070172432] AH01909: localhost:4443:0 server certificate does NOT include an ID which matches the server name
[Sat Feb 23 12:38:12.005761 2019] [mpm_event:notice] [pid 1288:tid 3070172432] AH00489: Apache/2.4.25 (Debian) OpenSSL/1.0.2q configured – resuming normal operations
[Sat Feb 23 12:38:12.005960 2019] [core:notice] [pid 1288:tid 3070172432] AH00094: Command line: ‘/usr/sbin/apache2’
[Sat Feb 23 12:40:27.943065 2019] [authz_host:error] [pid 1451:tid 2758054944] [client 192.168.178.100:55114] AH01753: access check of ‘localhost’ to / failed, reason: unable to get the remote host name
[Sat Feb 23 12:40:28.011812 2019] [authz_host:error] [pid 1451:tid 2758054944] [client 192.168.178.100:55114] AH01753: access check of ‘localhost’ to / failed, reason: unable to get the remote host name
[Sat Feb 23 12:40:28.012798 2019] [authz_host:error] [pid 1451:tid 2758054944] [client 192.168.178.100:55114] AH01753: access check of ‘localhost’ to /index.php failed, reason: unable to get the remote host name
[Sat Feb 23 12:40:28.062757 2019] [authz_host:error] [pid 1451:tid 2758054944] [client 192.168.178.100:55114] AH01753: access check of ‘localhost’ to /index.php failed, reason: unable to get the remote host name
[Sat Feb 23 12:40:30.217987 2019] [proxy_fcgi:error] [pid 1451:tid 2758054944] [client 192.168.178.100:55114] AH01071: Got error ‘PHP message: PHP Notice: Undefined index: app in /var/www/ncp-web/index.php on line 214\n’
[Sat Feb 23 12:40:30.221356 2019] [authz_host:error] [pid 1451:tid 2791658528] [client 192.168.178.100:55114] AH01753: access check of ‘localhost’ to /img/loading-small.gif failed, reason: unable to get the remote host name
[Sat Feb 23 12:40:30.234488 2019] [authz_host:error] [pid 1451:tid 2758054944] [client 192.168.178.100:55114] AH01753: access check of ‘localhost’ to /js/minified.js failed, reason: unable to get the remote host name
[Sat Feb 23 12:40:30.234525 2019] [authz_host:error] [pid 1451:tid 2766455840] [client 192.168.178.100:55114] AH01753: access check of ‘localhost’ to /js/ncp.js failed, reason: unable to get the remote host name
[Sat Feb 23 12:40:30.235108 2019] [authz_host:error] [pid 1451:tid 2783257632] [client 192.168.178.100:55114] AH01753: access check of ‘localhost’ to /img/ncp-logo.svg failed, reason: unable to get the remote host name
[Sat Feb 23 12:40:30.235595 2019] [authz_host:error] [pid 1451:tid 2774856736] [client 192.168.178.100:55114] AH01753: access check of ‘localhost’ to /css/ncp.css failed, reason: unable to get the remote host name
[Sat Feb 23 12:40:30.380726 2019] [authz_host:error] [pid 1450:tid 2758054944] [client 192.168.178.100:55115] AH01753: access check of ‘localhost’ to /ncp-output.php failed, reason: unable to get the remote host name
[Sat Feb 23 12:40:30.391014 2019] [authz_host:error] [pid 1450:tid 2766455840] [client 192.168.178.100:55115] AH01753: access check of ‘localhost’ to /ncp-launcher.php failed, reason: unable to get the remote host name
[Sat Feb 23 12:40:34.829141 2019] [authz_host:error] [pid 1450:tid 2766455840] [client 192.168.178.100:55115] AH01753: access check of ‘localhost’ to /ncp-launcher.php failed, reason: unable to get the remote host name

Hat jemand eine gute Idee?

Wie ich gerade feststellen konnte, treten die o.g. Errors auf, wenn ich das WebUI aufrufe!
Ich erreiche mein WebUI jedoch ausschließlich über die IP der nechtcloudpi plus “:4443” und nicht über “Mydomain:4443” oder “nextcloud.lan:4443”.

Was ist hier bei mir falsch eingerichtet?