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On running the docker command, I get following error:

docker run hello-world

Pulling repository docker.io/library/hello-world
docker: Network timed out while trying to connect to https://index.docker.io/v1/repositories/library/hello-world/images. You may want to check your internet connection or if you are behind a proxy..

I am getting following CURL output:

 curl -v https://index.docker.io

* Rebuilt URL to: https://index.docker.io/

* Hostname was NOT found in DNS cache

*   Trying 54.152.78.181...

* Connected to index.docker.io (54.152.78.181) port 443 (#0)

* successfully set certificate verify locations:

*   CAfile: none

  CApath: /etc/ssl/certs

* SSLv3, TLS handshake, Client hello (1):





* Unknown SSL protocol error in connection to index.docker.io:443

* Closing connection 0

curl: (35) Unknown SSL protocol error in connection to index.docker.io:443

So how will i pull my machines now?

Now getting following message:

Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
03f4658f8b78: Downloading
a3ed95caeb02: Downloading
docker: x509: certificate signed by unknown authority.

Update(obfuscated keys):

running following command gives output:

~$ openssl s_client -connect index.docker.io:443

CONNECTED(00000003)

depth=1 C = US, O = GeoTrust Inc., CN = RapidSSL SHA256 CA - G3

verify error:num=20:unable to get local issuer certificate

verify return:0

---

Certificate chain

 0 s:/OU=GT98568428/OU=See www.rapidssl.com/resources/cps (c)15/OU=Domain Control Validated - RapidSSL(R)/CN=*.docker.io

   i:/C=US/O=GeoTrust Inc./CN=RapidSSL SHA256 CA - G3

 1 s:/C=US/O=GeoTrust Inc./CN=RapidSSL SHA256 CA - G3

   i:/C=US/O=GeoTrust Inc./CN=GeoTrust Global CA

---

Server certificate

-----BEGIN CERTIFICATE-----

MIIEpDCCA4ygAwIBAgIDAyF3MA0GCSqGSIb3DQEBCwUAMEcxCzAJBgNVBAYTAlVT

MRYwFAYDVQQKEw1HZW9UcnVzdCBJbmMuLQYDVQQLEyZEb21haW4gQ29udHJvbCBW

YWxpZGF0ZWQgLSBSYXBpZFNTTChSKTEUMBIGA1UEAwwLKi5kb2NrZXIuaW8wggEi

MA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQDRyme75dbw9AxWZ8QFCwMWrrYY

SclZ6HCiEbxSNxHgg08rEfEYi46VrL+joBwlA0t5WIIxHF198NzzdXC4YeGzruY9

7osv5lPrcdeIi+Ad+fY6K0rBBOB3xdqSPPObrINZpDmWhCQjlsnM6a1Th0oSUCjI

345b84/8PH363YO+Qmnl8BWnaTcZoPzeywM9czQsMyF2bOH+dhxja/zim6iu8W34

yBhVQeQRd1QROuHcsQAX19DKTn6TXaAwIBY3xM1Bi5Zl6tueII4dOEoibw/ImR3c

H73Pk7j1Wx+rAXeeq7LwjkUCCSlKNrHFEQ2nbr0R7FH6cck1ppgM8ud1pHr9AgMB

AAGjggFOMIIBSjAfBgNVHSMEGDAWgBTDnPP800YINLvORn+gfFvz4gjLWTBXBggr

BgEFBQcBAQRLMEkwHwYIKwYBBQUHMAGGE2h0dHA6Ly9ndi5zeW1jZC5jb20wJgYI

KwYBBQUHMAKGGmh0dHA6Ly9ndi5zeW1jYi5jb20vZ3YuY3J0MA4GA1UdDwEB/wQE

AwIFoDAdBgNVHSUEFjAUBggrBgEFBQcDAQYIKwYBBQUHAwIwIQYDVR0RBBowGIIL

Ki5kb2NrZXIuaW+CCWRvY2tlci5pbzArBgNVHR8EJDAiMCCgHqAchhpodHRwOi8v

Z3Yuc3ltY2IuY29tL2d2LmNybDAMBgNVHRMBAf8EAjAAMEEGA1UdIAQ6MDgwNgYG

Z4EMAQIBMCwwKgYIKwYBBQUHAgEWHmh0dHBzOi8vd3d3LnJhcGlkc3NsLmNvbS9s

ZWdhbDANBgkqhkiG9w0BAQsFAAOCAQEATYgwOYz/w9Qyh/YPZQDZ0BdwhkX6OCX0

Mz8pP/OO+E+1RM7ZoAGwHvIaidFqh3WeCLHjGO2IId7Ff5EZUwZhiwog0R7Y838x

OCLza/2shuvjM/FPiyXDQ6q0w4rvpwsNjmYVDdYD8bCH3b8IlO2ysjgdhRYprsdU

jg6h+zK11/tXf6S5vegrgV0F62DYx0tuTTZq/HMuXvbgY2uL1sQ5jiHlzQndV9oL

YMYqJP5MkuAKzDL5u0b8mD/EHtoPkfWOIsA5i9YrAAoWRVOJHwfFfgSY+EpXpFc4

AZUPmdZGh6q1YNavRoOL/1D5aP/VBBtofj54uMbKOK8q6vxIXSyzaw==

-----END CERTIFICATE-----

subject=/OU=GT98568428/OU=See www.rapidssl.com/resources/cps (c)15/OU=Domain Control Validated - RapidSSL(R)/CN=*.docker.io

issuer=/C=US/O=GeoTrust Inc./CN=RapidSSL SHA256 CA - G3

---

No client certificate CA names sent

---

SSL handshake has read 2914 bytes and written 421 bytes

---

New, TLSv1/SSLv3, Cipher is ECDHE-RSA-AES128-GCM-SHA256

Server public key is 2048 bit

Secure Renegotiation IS supported

Compression: NONE

Expansion: NONE

SSL-Session:

    Protocol  : TLSv1.2

    Cipher    : ECDHE-RSA-AES128-GCM-SHA256

    Session-ID: 111E09F815E121C7EA7E7FD0C07C4AC31FFDE4E13AD9BA926AFF03A2E267130C

    Session-ID-ctx:

    Master-Key: 78A4ABC11BFCCA245F4B3FE8BDA0C0BC3A10D3E9BB447838B06D8BB16DA1553DBBCBFE03408AF34FB7D0CA5E3E7E8D40

    Key-Arg   : None

    PSK identity: None

    PSK identity hint: None

    SRP username: None

    TLS session ticket lifetime hint: 300 (seconds)

    TLS session ticket:

    0000 - 57 92 4f 5c a0 41 ab d9-62 2c b1 05 66 b5 bc 79   W.O.A..b,..f..y

    0010 - c8 32 a1 b0 f3 df 3d e7-c8 8d 0b 62 b2 6f 2b 99   .2....=....b.o+.

    0020 - 80 e1 60 73 19 67 bd c5-bf 4c 61 26 ca 3c 4d bd   ..`s.g...La&.i...

    0090 - ea ca 71 3e 9a 64 e8 23-dc f6 77 b4 6a 59 ac cd   ..q>.d.#..w.jY..

    Start Time: 1456385623

    Timeout   : 300 (sec)

    Verify return code: 20 (unable to get local issuer certificate)

---

I tried following commands but in vain:

sudo update-ca-certificates
sudo service docker restart

Also following command results:

# update-ca-certificates



Updating certificates in /etc/ssl/certs... unable to load certificate

140587866932896:error:0906D06C:PEM routines:PEM_read_bio:no start line:pem_lib.c:703:Expecting: TRUSTED CERTIFICATE

unable to load certificate

140365960205984:error:0906D06C:PEM routines:PEM_read_bio:no start line:pem_lib.c:703:Expecting: TRUSTED CERTIFICATE

WARNING: Skipping duplicate certificate cacerthaxx.pem

WARNING: Skipping duplicate certificate UbuntuOne-Go_Daddy_Class_2_CA.pem

WARNING: Skipping duplicate certificate UbuntuOne-Go_Daddy_Class_2_CA.pem

4 added, 0 removed; done.

Running hooks in /etc/ca-certificates/update.d....done.

root@Data-Server:~# update-ca-certificates -f

Clearing symlinks in /etc/ssl/certs...done.

Updating certificates in /etc/ssl/certs... unable to load certificate

140706921281184:error:0906D06C:PEM routines:PEM_read_bio:no start line:pem_lib.c:703:Expecting: TRUSTED CERTIFICATE

unable to load certificate

139841225197216:error:0906D06C:PEM routines:PEM_read_bio:no start line:pem_lib.c:703:Expecting: TRUSTED CERTIFICATE

WARNING: Skipping duplicate certificate cacerthaxx.pem

WARNING: Skipping duplicate certificate UbuntuOne-Go_Daddy_Class_2_CA.pem

WARNING: Skipping duplicate certificate UbuntuOne-Go_Daddy_Class_2_CA.pem

177 added, 0 removed; done.

Running hooks in /etc/ca-certificates/update.d....done.

related : https://github.com/docker/docker/issues/10150

Could be just a flaky connection. Both https://index.docker.io/v1/repositories/library/hello-world/images and https://index.docker.io works for me.

$  curl -v https://index.docker.io

* Rebuilt URL to: https://index.docker.io/

*   Trying 54.152.78.181...

* Connected to index.docker.io (54.152.78.181) port 443 (#0)

* TLS 1.2 connection using TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256

* Server certificate: *.docker.io

* Server certificate: RapidSSL SHA256 CA - G3

* Server certificate: GeoTrust Global CA

> GET / HTTP/1.1

> Host: index.docker.io

> User-Agent: curl/7.43.0

> Accept: */*

> 

< HTTP/1.1 301 MOVED PERMANENTLY

< Server: nginx/1.6.2

< Date: Thu, 25 Feb 2016 07:17:55 GMT

< Content-Type: text/html; charset=utf-8

< Transfer-Encoding: chunked

< X-Frame-Options: SAMEORIGIN

< Location: https://registry.hub.docker.com/

< Strict-Transport-Security: max-age=31536000

< 

* Connection #0 to host index.docker.io left intact

You can try checking your SSL connection

$ openssl s_client -connect index.docker.io:443