net::ERR_CERT_COMMON_NAME_INValiD plesk 8443

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when I try it with webdesign-best.de:8443 comes:

webdesign-best.de:8443' appears to be a DNS hostname but cannot match against hostname schema for TLD 'de:8443'
'webdesign-best.de:8443' does not appear to be a valid local network name