Test whether a TCP port on a host is open and reachable.
Common ports: 22 SSH, 25 SMTP, 80 HTTP, 443 HTTPS, 3306 MySQL, 8080 HTTP-ALT.
有新優惠時寄送一封簡短郵件。精選主機優惠與降價資訊 — 已驗證，無垃圾郵件。
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