Ryfujk

I get this consistenly (Ubuntu 16.04 LTS):

$ docker pull nginx

Using default tag: latest

Error response from daemon: Get https://registry-1.docker.io/v2/: net/http: TLS handshake timeout

However curl TLS works fine (apart from the auth error):

$ curl https://registry-1.docker.io/v2/

{"errors":[{"code":"UNAUTHORIZED","message":"authentication required","detail":null}]}

And even a small golang program (to mimic docker) works fine:

package main

import (

    "fmt"

    "io/ioutil"

    "net/http"

)

func main() {

    resp, err := http.Get("https://registry-1.docker.io/v2/")

    if err != nil {

        panic(err)

    }

    defer resp.Body.Close()

    body, err := ioutil.ReadAll(resp.Body)

    if err != nil {

        panic(err)

    }

    fmt.Println("Got: ", string(body))

}

The pcap for the docker TLS timeout request:

reading from file docker-timeout.pcap, link-type LINUX_SLL (Linux cooked)

00:38:54.782452 IP my-ubuntu.52036 > registry-1.docker.io.https: Flags [S], seq 26945613, win 29200, options [mss 1460,sackOK,TS val 1609360 ecr 0,nop,wscale 7], length 0

00:38:54.878630 IP registry-1.docker.io.https > my-ubuntu.52036: Flags [S.], seq 2700732154, ack 26945614, win 26847, options [mss 1460,sackOK,TS val 947941366 ecr 1609360,nop,wscale 8], length 0

00:38:54.878691 IP my-ubuntu.52036 > registry-1.docker.io.https: Flags [.], ack 1, win 229, options [nop,nop,TS val 1609384 ecr 947941366], length 0

00:38:54.878892 IP my-ubuntu.52036 > registry-1.docker.io.https: Flags [P.], seq 1:156, ack 1, win 229, options [nop,nop,TS val 1609384 ecr 947941366], length 155

00:38:55.175931 IP my-ubuntu.52036 > registry-1.docker.io.https: Flags [P.], seq 1:156, ack 1, win 229, options [nop,nop,TS val 1609459 ecr 947941366], length 155

00:38:55.475954 IP my-ubuntu.52036 > registry-1.docker.io.https: Flags [P.], seq 1:156, ack 1, win 229, options [nop,nop,TS val 1609534 ecr 947941366], length 155

00:38:56.076327 IP my-ubuntu.52036 > registry-1.docker.io.https: Flags [P.], seq 1:156, ack 1, win 229, options [nop,nop,TS val 1609684 ecr 947941366], length 155

00:38:57.280103 IP my-ubuntu.52036 > registry-1.docker.io.https: Flags [P.], seq 1:156, ack 1, win 229, options [nop,nop,TS val 1609985 ecr 947941366], length 155

00:38:59.684095 IP my-ubuntu.52036 > registry-1.docker.io.https: Flags [P.], seq 1:156, ack 1, win 229, options [nop,nop,TS val 1610586 ecr 947941366], length 155

00:39:04.492102 IP my-ubuntu.52036 > registry-1.docker.io.https: Flags [P.], seq 1:156, ack 1, win 229, options [nop,nop,TS val 1611788 ecr 947941366], length 155

00:39:04.879468 IP my-ubuntu.52036 > registry-1.docker.io.https: Flags [F.], seq 156, ack 1, win 229, options [nop,nop,TS val 1611884 ecr 947941366], length 0

00:39:04.976015 IP registry-1.docker.io.https > my-ubuntu.52036: Flags [.], ack 1, win 105, options [nop,nop,TS val 947943890 ecr 1609384,nop,nop,sack 1 {156:157}], length 0

00:39:04.976073 IP my-ubuntu.52036 > registry-1.docker.io.https: Flags [P.], seq 1:156, ack 1, win 229, options [nop,nop,TS val 1611909 ecr 947943890], length 155

00:39:05.275922 IP my-ubuntu.52036 > registry-1.docker.io.https: Flags [P.], seq 1:156, ack 1, win 229, options [nop,nop,TS val 1611984 ecr 947943890], length 155

00:39:05.876104 IP my-ubuntu.52036 > registry-1.docker.io.https: Flags [P.], seq 1:156, ack 1, win 229, options [nop,nop,TS val 1612134 ecr 947943890], length 155

What could possibly be going wrong?

net/http: TLS handshake timeout means that you have slow internet connection. Default value of connection timeout is too small for your enviroment. Unfortunally docker don't have any settings that allows you change connection timeout.
You may try to create own registry cache somewhere else and pull images from it.

If you are using a private registry, you need to place the certificate for that under /etc/docker/certs.d/registryname/ca.crt

registryname will change accordingly

Also, please change your MTU size to 1300, this was also one thing I did to resolve the error. Registry one I believe you might have already done.
Command for MTU change

ip link set dev eth0 mtu 1300

MTU size is important to check to avoid this error if you're internet speed is really good

I had an equal Problem, by using docker run hello-world 1st time, which results in downloading an image using https://registry-1.docker.io/v2/, which end to

docker: Error response from daemon: Get https://registry-1.docker.io/v2/: proxyconnect tcp: net/http: TLS handshake timeout.

Searching the web for hours and found out, that this happens at some users with ubuntu 18.04 and the current docker release, behind an proxy.
A workaround is to remove all the https-proxy configuration in order to leave only the http-proxy configuration, to force an http (not https) download.

Don't know, what the real reason is.

(by the way: I had an equal "TLS handshake" problem with composer and packagist. This was because of an missing cacert.pem file, which was not provided by ubuntu by default. Maybe this docker-problem is going into the same direction?)

In my case my server was behind the nat and proxy and set to auto detect proxy what i have done on current terminal i have export proxy settings

root@k8master:~/runner# export http_proxy="http://192.168.10.208:3128"

root@k8master:~/runner# docker pull gitlab/gitlab-runner:latest

latest: Pulling from gitlab/gitlab-runner

7b722c1070cd: Pull complete 

5fbf74db61f1: Pull complete 

ed41cb72e5c9: Pull complete 

7ea47a67709e: Pull complete 

ae336ceeca88: Pull complete 

f9f79780e6cf: Pull complete 

67e622273f37: Pull complete 

bc84c40af701: Pull complete 

69e36092e9de: Pull complete 

Digest: sha256:b1f5387942aaaf8c220f6613a1e96ba2cbcb6c58a5e47ca0df8ae3216720a15e

Status: Downloaded newer image for gitlab/gitlab-runner:latest