Hello @Sylvio, your problem sounded familiar to me... same hosting provider as another person in Taiwan. Checking you domain using https://check-your-website.server-daten.de/?q=legia.com.tw confirmed the same dns problems. There are 9 name servers the company is using. However there is a mismatch between the delegation and the zone. The primary SOA of ns.hinetidc.net is not included in the delegation.
Two of the name servers do not support TCP connections.
And this should be addressed:
Chrome-Connection: info. obsolete connection settings. The connection to this site is encrypted and authenticated using TLS 1.2, RSA, and AES_256_GCM.