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Addtrust External CA Root

Comodo root used for Comodo range of products.

It can be imported from here: http://www.tbs-x509.com/AddTrustExternalCARoot.crt or use the text version here under.

Its CRL is available here: http://crl.comodoca.com/AddTrustExternalCARoot.crl

Valid until May 30 10:48:38 2020 GMT
Length: 2048-bit
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
Certificate:
    Data:
        Version: 3 (0x2)
        Serial Number: 1 (0x1)
        Signature Algorithm: sha1WithRSAEncryption
        Issuer: C=SE, O=AddTrust AB, OU=AddTrust External TTP Network, CN=AddTrust External CA Root
        Validity
            Not Before: May 30 10:48:38 2000 GMT
            Not After : May 30 10:48:38 2020 GMT
        Subject: C=SE, O=AddTrust AB, OU=AddTrust External TTP Network, CN=AddTrust External CA Root
        Subject Public Key Info:
            Public Key Algorithm: rsaEncryption
                Public-Key: (2048 bit)
                Modulus:
                    00:b7:f7:1a:33:e6:f2:00:04:2d:39:e0:4e:5b:ed:
                    1f:bc:6c:0f:cd:b5:fa:23:b6:ce:de:9b:11:33:97:
                    a4:29:4c:7d:93:9f:bd:4a:bc:93:ed:03:1a:e3:8f:
                    cf:e5:6d:50:5a:d6:97:29:94:5a:80:b0:49:7a:db:
                    2e:95:fd:b8:ca:bf:37:38:2d:1e:3e:91:41:ad:70:
                    56:c7:f0:4f:3f:e8:32:9e:74:ca:c8:90:54:e9:c6:
                    5f:0f:78:9d:9a:40:3c:0e:ac:61:aa:5e:14:8f:9e:
                    87:a1:6a:50:dc:d7:9a:4e:af:05:b3:a6:71:94:9c:
                    71:b3:50:60:0a:c7:13:9d:38:07:86:02:a8:e9:a8:
                    69:26:18:90:ab:4c:b0:4f:23:ab:3a:4f:84:d8:df:
                    ce:9f:e1:69:6f:bb:d7:42:d7:6b:44:e4:c7:ad:ee:
                    6d:41:5f:72:5a:71:08:37:b3:79:65:a4:59:a0:94:
                    37:f7:00:2f:0d:c2:92:72:da:d0:38:72:db:14:a8:
                    45:c4:5d:2a:7d:b7:b4:d6:c4:ee:ac:cd:13:44:b7:
                    c9:2b:dd:43:00:25:fa:61:b9:69:6a:58:23:11:b7:
                    a7:33:8f:56:75:59:f5:cd:29:d7:46:b7:0a:2b:65:
                    b6:d3:42:6f:15:b2:b8:7b:fb:ef:e9:5d:53:d5:34:
                    5a:27
                Exponent: 65537 (0x10001)
        X509v3 extensions:
            X509v3 Subject Key Identifier: 
                AD:BD:98:7A:34:B4:26:F7:FA:C4:26:54:EF:03:BD:E0:24:CB:54:1A
            X509v3 Key Usage: 
                Certificate Sign, CRL Sign
            X509v3 Basic Constraints: critical
                CA:TRUE
            X509v3 Authority Key Identifier: 
                keyid:AD:BD:98:7A:34:B4:26:F7:FA:C4:26:54:EF:03:BD:E0:24:CB:54:1A
                DirName:/C=SE/O=AddTrust AB/OU=AddTrust External TTP Network/CN=AddTrust External CA Root
                serial:01

    Signature Algorithm: sha1WithRSAEncryption
        b0:9b:e0:85:25:c2:d6:23:e2:0f:96:06:92:9d:41:98:9c:d9:
        84:79:81:d9:1e:5b:14:07:23:36:65:8f:b0:d8:77:bb:ac:41:
        6c:47:60:83:51:b0:f9:32:3d:e7:fc:f6:26:13:c7:80:16:a5:
        bf:5a:fc:87:cf:78:79:89:21:9a:e2:4c:07:0a:86:35:bc:f2:
        de:51:c4:d2:96:b7:dc:7e:4e:ee:70:fd:1c:39:eb:0c:02:51:
        14:2d:8e:bd:16:e0:c1:df:46:75:e7:24:ad:ec:f4:42:b4:85:
        93:70:10:67:ba:9d:06:35:4a:18:d3:2b:7a:cc:51:42:a1:7a:
        63:d1:e6:bb:a1:c5:2b:c2:36:be:13:0d:e6:bd:63:7e:79:7b:
        a7:09:0d:40:ab:6a:dd:8f:8a:c3:f6:f6:8c:1a:42:05:51:d4:
        45:f5:9f:a7:62:21:68:15:20:43:3c:99:e7:7c:bd:24:d8:a9:
        91:17:73:88:3f:56:1b:31:38:18:b4:71:0f:9a:cd:c8:0e:9e:
        8e:2e:1b:e1:8c:98:83:cb:1f:31:f1:44:4c:c6:04:73:49:76:
        60:0f:c7:f8:bd:17:80:6b:2e:e9:cc:4c:0e:5a:9a:79:0f:20:
        0a:2e:d5:9e:63:26:1e:55:92:94:d8:82:17:5a:7b:d0:bc:c7:
        8f:4e:86:04



Keeping using old browsers:

You may need to maintain the compatibility of your certificate with old versions of clients/OS that cannot be updated (Internet Explorer 6 under Microsoft XP SP1 for example).
It is then possible to replace this root by the following chain (meaning deactivate this root on your server to install manually the following chain):

This old certification chain can pose problems with old systems (Citrix, routers...). Make sure your system works properly with this certification chain.

sha1 / sha2 intermediate:

This root certificate, signed with SHA1 hash algorithm, will be used as an intermediate for SHA1-signed certificates.
For example: COMODO High-Assurance Secure Server CA

For SHA256 Comodo certificates using a HSA256-signed certification chain, you'll have to install a new certification chain provided on your certificate status page. Follow the installation procedure here:
Install a SSL certificate on a server