Synyi Domain Security

generated: '2026-08-29'
method: probed
source: live DNS/TLS/HTTP probes of www.synyi.com and synyi.com, 2026-08-29
note: >-
  The automated probe initially recorded https:false for www.synyi.com. That was a false
  negative caused by request timeouts against a China-hosted origin — the host is reachable
  but slow and intermittently unresponsive from US vantage points. Re-probed by hand: HTTPS
  is served correctly over HTTP/2 with a valid certificate. Every value below was verified
  directly and the header/record evidence is recorded alongside it.
hosts:
- host: www.synyi.com
  https: true
  http_status: 200
  http_version: '2'
  tls_verify_result: 0
  tls_certificate:
    subject: CN=*.synyi.com
    not_before: '2025-12-04'
    not_after: '2027-01-01'
    wildcard: true
  hsts: false
  hsts_header: null
  http_to_https_redirect: true
  redirect_evidence: http://www.synyi.com/ returns 301 to https://www.synyi.com:443/
  server_header: Apache/2.4.54 (Debian)
  findings:
  - >-
    No Strict-Transport-Security header is returned, so a first-contact downgrade is possible
    even though HTTP does redirect to HTTPS.
  - >-
    The Server header discloses an exact software version (Apache/2.4.54, Debian), which is
    unnecessary version disclosure.
  - >-
    A wildcard certificate (*.synyi.com) is combined with wildcard DNS, so every subdomain —
    including api., open., developer., docs., mcp. — presents a valid certificate regardless
    of whether a service exists behind it. api.synyi.com answers 503 and open.synyi.com serves
    the stock nginx default page, both under a trusted certificate.
- host: api.synyi.com
  https: true
  http_status: 503
  tls_certificate:
    subject: CN=*.synyi.com
    not_after: '2027-01-01'
    wildcard: true
  findings:
  - nginx vhost resolving via wildcard DNS with no upstream; returns 503 on every path probed.
- host: open.synyi.com
  https: true
  http_status: 200
  tls_certificate:
    subject: CN=*.synyi.com
    not_after: '2027-01-01'
    wildcard: true
  findings:
  - Serves the stock "Welcome to nginx!" default page (612 bytes); an unconfigured vhost.
domains:
- domain: synyi.com
  dnssec: false
  dnssec_evidence: no DS record returned for synyi.com
  caa: []
  caa_evidence: no CAA record returned for synyi.com
  spf: true
  spf_record: v=spf1 include:spf.protection.partner.outlook.cn -all
  spf_note: >-
    Hard-fail (-all) policy delegating to Microsoft 365 operated by 21Vianet (the China
    instance), consistent with the MX record synyi-com.mail.protection.partner.outlook.cn.
  dmarc: false
  dmarc_evidence: no TXT record returned for _dmarc.synyi.com
  mx:
  - ' 1 synyi-com.mail.protection.partner.outlook.cn.'
summary: >-
  TLS is correctly deployed and SPF is strict, but three controls are absent: HSTS, DMARC and
  DNSSEC. Absent CAA is also recorded. The absences are valid measured data, not probe failures.