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crypto/x509: error "x509: certificate signed by unknown authority" on valid SSL chain #16589

rasky opened this issue Aug 3, 2016 · 7 comments


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@rasky rasky commented Aug 3, 2016

Please answer these questions before submitting your issue. Thanks!

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

go version go1.7rc4 darwin/amd64

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

GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/lw/jdbk7p_d4gj6qpydczpbw2080000gn/T/go-build080916688=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

package main

import (

func main() {
    resp, err := http.Get("")
    if err != nil {

    io.Copy(os.Stdout, resp.Body)

What did you expect to see?

Some HTML output

What did you see instead?

panic: Get x509: certificate signed by unknown authority

goroutine 1 [running]:
panic(0x1fcd00, 0xc420400060)
    /usr/local/Cellar/go/1.7rc4/libexec/src/runtime/panic.go:500 +0x1a1
    /private/tmp/test.go:12 +0xd0
exit status 2

Notice that visiting the same link with Safari produces no SSL error. The SSL certificate chain seems correct and the Comodo ECC CA is in OS X trust store.

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@mdempsky mdempsky commented Aug 3, 2016

/cc @agl

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@jmassara jmassara commented Aug 3, 2016

I believe this is a dup of #16532.

@bradfitz bradfitz changed the title net/http: error "x509: certificate signed by unknown authority" on valid SSL chain crypto/x509: error "x509: certificate signed by unknown authority" on valid SSL chain Aug 3, 2016
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@josharian josharian commented Aug 4, 2016

This isn't a dup of #16532, I think, because that issue is for the non-cgo code path, and go env indicates that cgo is enabled here.

@quentinmit quentinmit added this to the Go1.8 milestone Aug 4, 2016
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@wmark wmark commented Aug 5, 2016

@rasky, I have noticed you are using OS darwin. Do you get the same error with, say, this site?

I have not been able to reproduce this using go version go1.7rc4 linux/amd64:

$ docker pull golang:1.7rc4
$ docker run -ti --rm d7e6aaff64ae

go version
# go version go1.7rc4 linux/amd64

# [… paste the above script as 16589.go]
go run 16589.go
CGO_ENABLED="1" go run 16589.go
# both don't panic
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Member Author

@rasky rasky commented Aug 5, 2016

@wmark yes, this bug is OSX-only, and it doesn't reproduce with the URL you linked.

@agl agl self-assigned this Aug 19, 2016
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@xfreshx xfreshx commented Oct 5, 2016

@rasky unfortunately have the same on windows x86. I built my app on win64 with

  • GOARCH=386
    on win64 everything is fine. OS X version (with only CGO_ENABLED=1) is fine as well.

Any solution available yet?

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@agl agl commented Feb 8, 2017

Best I can tell, this is caused by "COMODO ECC Certification Authority" not being included in some OS X versions.

With 10.10, it's not included. That site can be loaded by Safari because the intermediate has an AIA pointer to a cross-sign from the AddTrust ECC root, which /is/ included. But the site isn't serving that cross-sign for Go.

With 10.12, the root is included and the test loads.

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