550 no FCrDNS

nginx

HTTP/1.1 404 Not Found
Server: nginx
Date: Sun, 06 Apr 2025 10:06:38 GMT
Content-Type: text/html
Content-Length: 548
Connection: keep-alive

nginx

HTTP/1.1 404 Not Found
Server: nginx
Date: Thu, 03 Apr 2025 15:35:21 GMT
Content-Type: text/html
Content-Length: 548
Connection: keep-alive

Certificate:
    Data:
        Version: 3 (0x2)
        Serial Number:
            22:b0:27:d1:ad:09:50:38:b3:b6:2e:45:fb:ce:f2:9a:4b:3a:35:69
        Signature Algorithm: sha256WithRSAEncryption
        Issuer: C=AU, ST=Some-State, O=Internet Widgits Pty Ltd
        Validity
            Not Before: Nov 20 10:12:17 2023 GMT
            Not After : Nov 19 10:12:17 2024 GMT
        Subject: C=AU, ST=Some-State, O=Internet Widgits Pty Ltd
        Subject Public Key Info:
            Public Key Algorithm: rsaEncryption
                Public-Key: (2048 bit)
                Modulus:
                    00:b1:c5:7b:8c:ba:4a:b2:f2:81:0b:64:bf:b4:a3:
                    c4:e3:47:cf:13:5c:79:b7:4d:12:a0:25:b4:bf:9d:
                    f3:b2:75:b5:bd:99:ab:c0:2a:0e:41:1c:61:0a:29:
                    72:4c:43:1c:6c:40:fa:54:5f:ef:a9:01:b6:c6:c1:
                    7b:8d:26:89:71:e6:e4:1a:d7:25:bd:d7:32:4a:24:
                    6e:5d:36:d9:58:1b:72:e1:6f:86:be:8d:ef:e5:f0:
                    5c:0b:06:a7:9e:5c:e4:af:d6:1a:f4:92:e8:53:c8:
                    4a:b2:41:7e:f6:11:f8:8a:20:4c:1c:94:cb:d8:7e:
                    62:5e:b5:e1:99:47:cc:f4:ac:f8:e3:49:c8:73:ad:
                    af:61:d3:0a:b6:ef:d0:7d:d3:f9:a4:5a:28:61:ba:
                    9f:3a:69:93:9d:45:28:be:d4:b2:ca:d6:f3:7c:90:
                    2c:f1:47:be:44:42:9e:05:38:a2:d5:69:5e:e9:7f:
                    3a:aa:d3:21:d3:66:f6:9c:ad:9b:a0:05:eb:71:43:
                    21:a3:62:7d:10:4b:bb:9f:12:13:09:33:f1:75:c8:
                    84:22:21:54:40:9f:b7:9f:6e:43:2d:1b:07:e3:13:
                    8f:8c:55:59:22:99:56:d3:e8:37:0a:09:7c:40:13:
                    ec:a0:e0:f3:c7:d4:c1:81:5f:85:b8:da:2b:f0:98:
                    00:55
                Exponent: 65537 (0x10001)
        X509v3 extensions:
            X509v3 Subject Key Identifier: 
                CE:89:CA:54:AD:A5:42:A5:CE:E6:56:32:25:4F:47:5C:BF:07:C8:23
            X509v3 Authority Key Identifier: 
                CE:89:CA:54:AD:A5:42:A5:CE:E6:56:32:25:4F:47:5C:BF:07:C8:23
            X509v3 Basic Constraints: critical
                CA:TRUE
    Signature Algorithm: sha256WithRSAEncryption
    Signature Value:
        9e:ce:4d:e2:95:34:9c:e1:e7:eb:c4:10:4c:fe:91:8e:20:f6:
        4b:85:77:d7:91:b6:a0:84:00:70:ed:75:55:34:86:0d:b5:8f:
        5f:41:75:b9:19:51:72:c8:a8:1e:9b:48:3c:50:49:e5:89:7c:
        76:bf:74:91:b5:9b:e4:5b:1e:4f:94:7b:0c:5b:88:e5:59:69:
        43:52:f7:b0:f2:46:c5:b3:86:f7:cf:05:95:4b:65:53:96:a8:
        47:00:a0:0f:d3:c8:1e:9d:96:94:a6:06:9e:a9:99:5c:50:5a:
        06:08:22:6f:dc:bd:1d:a5:35:9d:11:94:aa:b8:f8:b9:63:dd:
        08:1c:50:fb:f4:49:f6:21:e2:f8:b5:f9:6e:cd:f1:7a:9e:b9:
        6c:71:d5:42:20:dc:79:21:6f:96:d4:b5:78:c4:b1:17:3c:8a:
        e6:7d:d3:d7:6f:76:fd:4c:a9:77:e3:8b:8a:e3:ac:d7:16:64:
        3b:36:8a:ec:a5:71:13:b5:39:15:e9:db:ce:dc:b4:4c:50:f8:
        f3:3b:bb:02:03:74:52:5f:41:f4:60:7b:71:d7:03:60:c6:e6:
        0b:d7:4c:2e:30:4e:b5:74:d7:77:58:87:61:2e:eb:01:7a:62:
        d3:27:d1:b7:9b:54:7d:c8:bc:0f:f3:53:2e:29:f5:3c:1f:0a:
        95:6b:37:a0

OpenSMTPD

220 vps-ad8a17e4.vps.ovh.net ESMTP OpenSMTPD\r\n

\x01\x01\x00,!\x12\xa4B0wUp2q2xqqjj\x00 \x00\x08\x00\x01E\xf9\x98\xb7\x1bY\x80"\x00\x14Coturn-4.6.2 \'Gorst\'\x80(\x00\x04\xf2\xcb\x8b\x1e

\x05\xff

<?xml version='1.0'?><stream:stream xmlns:stream='http://etherx.jabber.org/streams' to='' version='1.0' xmlns='jabber:server' xml:lang='en' id='1fa24479-19ef-4349-923b-9148d0ec1394' from='51.210.102.169'><stream:error><host-unknown xmlns='urn:ietf:params:xml:ns:xmpp-streams'/><text xmlns='urn:ietf:params:xml:ns:xmpp-streams'>This host does not serve 51.210.102.169</text></stream:error></stream:stream>