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The APS Catalog has been deprecated and removed from all Plesk Obsidian versions. Applications already installed from the APS Catalog will continue working. However, Plesk will no longer provide support for APS applications.
Please be aware: with the Plesk Obsidian 18.0.78 release, the support for the ngx_pagespeed.so module will be deprecated and removed from the sw-nginx package.
This is a question DNS settings. Make sure that your hostname core.domain.tld is resolvable to correct IP address. Looks like you need to change it on your DNS server which handles your domain.tld.
; <<>> DiG 9.9.4-RedHat-9.9.4-38.el7_3.1 <<>> axfr plugindb.de @dns.dns1.de
;; global options: +cmd
plugindb.de. 86400 IN SOA dns.dns1.de. hostmaster.plugindb.de. 2017020401 28800 7200 604800 86400 *.plugindb.de. 300 IN A 84.200.222.54
core.plugindb.de. 300 IN A 84.200.222.54
imap.plugindb.de. 300 IN A 84.200.222.54
mail.plugindb.de. 300 IN A 84.200.222.54
plugindb.de. 300 IN A 84.200.222.54
plugindb.de. 300 IN MX 10 mail.plugindb.de.
plugindb.de. 300 IN NS dns.dns1.de.
plugindb.de. 300 IN NS dns.dns2.de.
plugindb.de. 300 IN NS dns.dns3.de.
plugindb.de. 300 IN NS dns.dns4.de.
server1.plugindb.de. 300 IN A 84.200.222.47
server2.plugindb.de. 300 IN A 84.200.113.78
server3.plugindb.de. 300 IN A 84.200.222.12
smtp.plugindb.de. 300 IN A 84.200.222.54
plugindb.de. 86400 IN SOA dns.dns1.de. hostmaster.plugindb.de. 2017020401 28800 7200 604800 86400
As you can see you have wildcard subdomain *.plugindb.de Therefore, any subdomain will be resolvable to 84.200.222.54 IP address. Even admin.plugindb.de:
# host admin.plugindb.de
admin.plugindb.de has address 84.200.222.54
# host hahaha.plugindb.de
hahaha.plugindb.de has address 84.200.222.54
# host tututututututu.plugindb.de
tututututututu.plugindb.de has address 84.200.222.54