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

go version go1.7 windows/amd64

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

set GOARCH=amd64
set GOBIN=
set GOEXE=.exe
set GOHOSTARCH=amd64
set GOHOSTOS=windows
set GOOS=windows
set GOPATH=c:\users\alex\dev
set GORACE=
set GOROOT=c:\users\alex\dev\go1.7
set GOTOOLDIR=c:\users\alex\dev\go1.7\pkg\tool\windows_amd64
set CC=gcc
set GOGCCFLAGS=-m64 -mthreads -fmessage-length=0 -fdebug-prefix-map=C:\Users\Alex\AppData\Local\Temp\go-build434466894=/tmp/go-build -gno-record-gcc-switches
set CXX=g++
set CGO_ENABLED=1

What did you do?

I run:

go test -v -run=TestHostKeyCert golang.org/x/crypto/ssh

What did you expect to see?

I expect test pass.

What did you see instead?

Test fails:

=== RUN   TestHostKeyCert
--- FAIL: TestHostKeyCert (0.00s)
        certs_test.go:184: netPipe: dial tcp [::]:54283: connectex: The requested address is not val
id in its context.
FAIL
exit status 1
FAIL    golang.org/x/crypto/ssh 0.674s

The code

$ sed '/func.netPipe/,+5!d' handshake_test.go
func netPipe() (net.Conn, net.Conn, error) {
        listener, err := net.Listen("tcp", ":0")
        if err != nil {
                return nil, nil, err
        }
        defer listener.Close()
$

seems to do what documentation recomends - see https://golang.org/pkg/net/#Dial

If the host is empty, as in ":80", the local system is assumed.

So I do not know how to fix this.

Discovered while investigating failed build of crypto release-branch.go1.7 on openbsd, plan9 and windows:
https://build.golang.org/log/2e657fbd75f7b1ca0e52e551af2c90bf56c1b3b9
https://build.golang.org/log/ea5b593440872582438c912aa7c4d5ecdfe32f5c
https://build.golang.org/log/e086a54ad3c3ff1c7dc65d4803e48850253720c5

Alex