There are numerous question on the web where people are having difficulty setting up self signed certificates for use on internal network.

Just to link a few:
Getting Chrome to accept self-signed localhost certificate
Chrome accept self-signed localhost certificate
Generating a self-signed cert with openssl that works in Chrome 58
StartCom certificate Error : ERR_CERT_AUTHORITY_INVALID

I have gone through each and every one of them but still can’t get rid of the (net::ERR_CERT_COMMON_NAME_INVALID). error.

Steps followed:

  • key & certificate generation on server

    openssl req           
    -newkey rsa:2048 
    -x509 
    -nodes 
    -keyout file.key 
    -new 
    -out file.crt 
    -subj /CN=Hostname 
    -reqexts SAN 
    -extensions SAN 
    -config <(cat /etc/ssl/openssl.cnf 
        <(printf '[SAN]nsubjectAltName=DNS:192.168.0.1')) 
    -sha256 
    -days 3650
    
  • setting up server process (apache) to use the newly generated certificate and key file for secure connections

  • exporting certificate file from the server on to the client by navigating to https://192.168.0.1:3122 through Chrome Dev Tools and using the Export option
  • adding the CA to list of known Certificate Authorities (on Fedora 26) using
    • certutil
    • sudo cp file.crt /etc/pki/ca-trust/source/anchors; sudo upate-ca-trust
  • restarting chrome

I have also tried various values for the CN field above like: hostname, common.name.com, Common Name, 192.168.0.1

Even after all this the error persists when I navigate to https://192.168.0.1:3122 and I no longer know what I am doing.

The text representation looks similar to:

Certificate:
    Data:
        Version: 3 (0x2)
        Serial Number:
            9e:ae:33:24:3a:2d:2b:e2
    Signature Algorithm: sha256WithRSAEncryption
        Issuer: CN = Hostname
        Validity
            Not Before: Oct 28 20:18:06 2017 GMT
            Not After : Oct 26 20:18:06 2027 GMT
        Subject: CN = Hostname
        Subject Public Key Info:
            Public Key Algorithm: rsaEncryption
                Public-Key: (2048 bit)
                Modulus:
                    00:a4:80:6c:3a:1b:5e:c4:e6:f6:7d:a5:be:d6:cd:
                    d9:23:bd:1a:b1:e6:f1:e3:b0:76:47:37:a3:d8:b0:
                    60:44:23:c3:8a:58:1c:c3:0a:99:3d:42:32:ca:8b:
                    ec:31:9d:a8:df:6c:13:43:e6:78:12:b8:24:04:5a:
                    9f:6e:11:24:2a:56:e3:20:36:78:a4:cc:ed:45:7c:
                    a3:c1:36:7b:25:f6:6b:2d:01:59:02:74:8b:7a:13:
                    ec:83:63:90:2e:a0:a3:aa:23:de:ea:f0:8e:1f:99:
                    b9:50:b1:5f:64:e4:c9:91:c0:0c:56:15:3c:c0:ff:
                    0f:bf:e1:af:7a:bf:51:40:37:b0:34:20:95:a1:05:
                    14:k2:35:20:e8:98:48:65:ad:26:cc:de:a2:50:48:
                    77:8c:e2:7a:d5:bd:83:96:86:ef:20:79:2f:15:a3:
                    07:48:f4:1f:c7:9d:a1:4b:bd:ee:47:83:51:f3:09:
                    27:ed:b7:09:c8:56:40:0c:68:25:92:d8:62:dc:14:
                    6c:fa:f1:e3:93:1b:79:3c:58:9c:53:69:ff:6a:0f:
                    ee:4c:9f:8e:22:2d:62:6b:b3:ae:22:d6:e3:d0:bd:
                    06:43:a7:c3:e1:1e:23:07:61:b0:4e:64:14:92:0c:
                    5b:f1:a8:c5:29:67:64:7d:65:10:b9:60:41:b8:3b:
                    1y:1f
                Exponent: 65537 (0x10001)
        X509v3 extensions:
            X509v3 Subject Alternative Name:
                DNS:192.168.0.1
    Signature Algorithm: sha256WithRSAEncryption
         11:65:6d:86:04:7f:5a:b0:ce:b2:6e:95:7e:03:8c:fe:a9:d0:
         81:2c:6f:50:63:2e:91:77:79:cd:27:32:b0:19:2b:ac:ea:c0:
         4b:f7:56:d9:be:34:54:f1:a6:1d:bc:d0:3b:bb:bf:90:0e:2d:
         1d:83:28:97:8e:f8:37:5d:3e:00:5a:cd:3d:36:5d:c4:5d:a8:
         7e:a4:59:f0:91:3d:af:3d:28:03:3e:78:3b:5b:0a:fb:24:34:
         02:a2:09:ec:d6:0c:58:63:ab:69:26:5e:fe:1d:1f:19:54:0f:
         68:4e:31:f9:de:1e:de:86:81:3f:b7:62:c5:67:02:05:a2:7a:
         03:f4:b5:3b:ba:c4:ba:26:8e:a2:ee:1c:ef:69:63:07:b0:97:
         fd:a8:42:e2:11:6d:de:b5:70:a5:4a:62:d2:62:d9:5b:17:f4:
         d5:cd:6f:71:75:dd:35:33:55:52:2e:30:29:f8:42:ec:b9:d3:
         82:85:a1:e7:f6:f5:90:dd:cb:07:15:a7:44:70:1c:93:e6:ec:
         03:3a:be:41:87:3c:f0:a4:88:a5:65:d9:29:2c:78:de:90:b8:
         6a:8b:99:6e:d0:e5:8c:08:a4:71:51:fd:1d:e1:8c:0c:17:d5:
         b0:31:fc:7f:99:23:dd:1a:c4:0b:45:17:68:88:67:c6:22:df:
         2b:ac:ea:c0

Please note that this is my 1st time setting up SSL/TLS certificates for such purposes. Please advice on how to get rid of the error.

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