check if you have the proper CAs mounted in the docker image of
alertmanager.
/etc/ssl/certs or the equivalent in your distro - if not, then there is no
source of truth for trusted CAs

On Mon, Mar 9, 2020 at 11:44 AM Brian Candler <[email protected]> wrote:

> On Monday, 9 March 2020 09:12:41 UTC, BDT wrote:
>>
>> level=debug ts=2020-03-09T08:46:12.143Z caller=notify.go:667
>> component=dispatcher msg="Notify attempt failed" attempt=1
>> integration=slack receiver=slack_general err="Post <redacted>: x509:
>> certificate signed by unknown authority"
>>
>>
>>
> The bit you've redacted - at least, the hostname in the URL - is the
> important part.  The error seems to be saying the *remote* server's
> certificate is bad, but not knowing the hostname you're connecting to, we
> can't check that.
>
> Is it showing the same URL as the slack "api_url: *****" in your config?
>
> Can you post to it using curl -v?  That would prove whether the
> certificate is OK or not.
>
> Are you behind some sort of nasty corporate firewall which breaks TLS by
> performing man-in-the-middle decryption?
>
>
>> My certificate is valid and I have checked for revocation, it's ok.
>>
>> You can go to https://alertmanager.cloud.patrowl.io and check. Just
>> cancel the http auth
>>
>>
>>
> Canceling the http auth just gives 401 forbidden.
>
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-- 
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