Ah, sorry I didn't see your script when I read initially. There shouldn't
be anything that applies to Packer and not normal ssh. It looks like your
ssh timeout is only about five minutes; no guarantees but you can try
bumping that higher and seeing if it's just a timing thing. Is there
anything exciting going on with proxies in your environment?

On Mon, Sep 21, 2020 at 12:32 AM Jonathan Hall <[email protected]> wrote:

> Hi Megan,
>
> Thanks for taking the time to reply.
>
> As you can see from my above config, I am configuring the SSH listen port
> in the startup script, and as I've also indicated, I have verified that it
> is also working by doing a manual SSH to the alternate port, which succeeds.
>
> So I'm confident that something _is_ listening on the other end.
>
> Is something else needed within Packer to allow this? Is there some other
> network/firewall type config I'm overlooking that applies to Packer, but
> not to direct SSH communication?
>
> Thank you,
> Jonathan
>
> On Friday, September 18, 2020 at 7:13:02 PM UTC+2 Megan Marsh wrote:
>
>> Packer cannot change the port that the ssh daemon is listening on in the
>> guest; if your startup-script isn't changing this, or it isn't being
>> configured elsewhere in your googlecompute configs, then it's probably
>> listening on the default and Packer's attempts to connect to the custom
>> port are in vain because no one is listening on the other end.
>>
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