crypto/tls: Dial error message does not give much context

[hramrach]

What version of Go are you using (go version)?

go version go1.11.13 linux/amd64

What operating system and processor architecture are you using (go env)?

go env Output

GOARCH="amd64"
GOBIN=""
GOCACHE="/home/mbirc/.cache/go-build"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/home/mbirc/go"
GOPROXY=""
GORACE=""
GOROOT="/usr/lib64/go/1.11"
GOTMPDIR=""
GOTOOLDIR="/usr/lib64/go/1.11/pkg/tool/linux_amd64"
GCCGO="gccgo"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build241684230=/tmp/go-build -gno-record-gcc-switches"

What did you do?

tls-client.go code

package main
import (

"crypto/tls"

"os"

"log"

)
func main() {

args:= os.Args
config := tls.Config{}
conn, err := tls.Dial("tcp", args[1] + ":" + args[2], &config)
if err != nil {
    log.Fatalf("client: dial: %s", err)
}
defer conn.Close()
log.Println("client: connected to: ", conn.RemoteAddr())

}

This does not work for the successful case but in error case it prints:

client: dial: remote error: tls: handshake failure

What did you expect to see?

Message that allows diagnosing the failure. Why has it failed to connect? Other clients connect fine.

What did you see instead?

Unexplained failure.

[andybons]

@FiloSottile

[hramrach]

This is possibly #7758 but without any indication what failed it is hard to tell.