443/tcp
TLS
first 2026-06-08 · last 2026-06-08
- TLS
- TLSv1.2
- Certificate for
- 249ad8672141
- Issued by
- Yealink Manufacturing CA
- Valid
- 2023-06-03 → 2033-05-31
Raw response
HTTP/1.1 400 Bad Request Server: YLServer Date: Mon, 08 Jun 2026 22:29:36 GMT Content-Type: text/html Content-Length: 653 Connection: close X-Frame-Options: SAMEORIGIN X-Content-Type-Options: nosniff X-XSS-Protection: 1; mode=block Strict-Transport-Security: max-age=31536000; includeSubDomains cache-control: private, max-age=0, no-cache, no-store, must-revalidate Content-Security-Policy: default-src 'self'; script-src 'self'; style-src 'self'; font-src 'self'; img-src 'self' data:; connect-src 'self'; object-src 'none'; base-uri 'self'; form-action 'self'; frame-ancestors 'self' <html> <head><title>400 The plain HTTP request was sent to HTTPS port</title></head> <body> <center><h1>400 Bad Request</h1></center> <center>The plain HTTP request was sent to HTTPS port</center> <hr><center>YLServer</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly e