# The authenticity of host 'github.com (192.30.255.113)' can't be established

**URL:** <https://forum.buildkite.community/t/the-authenticity-of-host-github-com-192-30-255-113-cant-be-established/532>\
**Category:** General\
**Created:** [May 31, 2019, 4:08am UTC](https://forum.buildkite.community/t/the-authenticity-of-host-github-com-192-30-255-113-cant-be-established/532 "2019-05-31T04:08:44Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![thirtytwobits](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.buildkite.community/thirtytwobits/32/542_2.png) [@thirtytwobits](https://forum.buildkite.community/u/thirtytwobits)\
**Post date:** [May 31, 2019, 4:08am UTC](https://forum.buildkite.community/t/the-authenticity-of-host-github-com-192-30-255-113-cant-be-established/532/1 "2019-05-31T04:08:44Z")

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I’m trying to reproduce the technique for pushing documentation to gh-pages published in [this blog post by circle-ci](https://circleci.com/blog/deploying-documentation-to-github-pages-with-continuous-integration) that uses the [node-js gh-pages program](https://www.npmjs.com/package/gh-pages) The agent successfully pulls from github at part of the “preparing working directory” build step but when it tries to push using gh-pages it deadlocks on an interactive prompt because the ssh key is unrecognized:

[https://buildkite.com/uavcan/libuavcan-v1/builds/69#b9f81135-db93-47cf-a38d-4871059](https://buildkite.com/uavcan/libuavcan-v1/builds/69#b9f81135-db93-47cf-a38d-4871059)

I’m not quite sure how to solve this using Buildkite. circle-ci had an “add\_ssh\_keys” map in their yaml to support this. Is this a missing feature in Buildkite and/or its docker plugin? Is there any way to work around this? Thanks.

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**Author:** ![thirtytwobits](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.buildkite.community/thirtytwobits/32/542_2.png) [@thirtytwobits](https://forum.buildkite.community/u/thirtytwobits)\
**Post date:** [May 31, 2019, 7:00am UTC](https://forum.buildkite.community/t/the-authenticity-of-host-github-com-192-30-255-113-cant-be-established/532/2 "2019-05-31T07:00:40Z")

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Found the problem. I was missing [https://github.com/buildkite-plugins/docker-buildkite-plugin#mount-ssh-agent-optional-boolean](https://github.com/buildkite-plugins/docker-buildkite-plugin#mount-ssh-agent-optional-boolean)

gh-pages appears to be working now.

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**Author:** ![anon85971592](https://avatars.discourse-cdn.com/v4/letter/a/dfb087/32.png) [@anon85971592](https://forum.buildkite.community/u/anon85971592)\
**Post date:** [August 1, 2019, 3:01am UTC](https://forum.buildkite.community/t/the-authenticity-of-host-github-com-192-30-255-113-cant-be-established/532/3 "2019-08-01T03:01:49Z")

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Glad you figured it out @thirtytwobits!