Websites prove their identity via certificates, which are valid for a set time period. The certificate for api-rrd.madavi.de:3000 expired on 19.08.2025. Error code: SEC_ERROR_EXPIRED_CERTIFICATE
What does this mean?
What is a certificate? Why get I once I click on api-rrd.madavi.de:3000 the message “Seite wurde nicht gefunden Die Verbindung mit dem Server api-rrd.madavi.de schlug fehl.”?
please read the explanation what a ceritficate is here in wikipedia in german or in english
for short: it tells your browser that the connection is valid, but each certificate ha an expiry date and that’s why you’ve seen the error. It must be renewed and installed on the server side.
I read the Wikipedia article but admittedly understood only very little. When the certificate for api-rrd.madavi.de expired, where is this certificate? On my PC or on the api-rrd.madavi.de side? In the latter case I can do nothing. If the certificate is on my PC, how shall I fix this issue?
I am no computer specialist and I just wanted an answer to my (obviously not so simple) question.
as you expect, the outdated certificate is on the server and the servers admin must replace it.
you can only jump over the error as you did and wait until …
Who is the server admin? How can I address him or her?
As suggested, I will wait until … end of my vacation in a week. 
you can try via „impressum“ to reach an admin.
at good hosted servers the surveillance mechanism should alert the admin, but who knows.
administrator should be in extended holidays, trying to reach him last month..
At first this is a volunteered project. Only a handful of persons is running the Mord than 10 servers in their späte time.
And yes, these persona also have holidays or other work to do.
The certificate is replaced. So grafana should work again.
(And no, wie don’t need an explanation what a certificate is. The message about the outdated certificate is enough…)
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since i’m a 63 year old sysadmin, i offer myself to the community, to help with these tasks..
i dont know the setup, but probably a crontab event to get new certificate every 2 months and reload web server and grafana would be doable..
I’ve checked the crontab again. The command were there, but with a typo in a path …
So the next cert updates should run automatically.
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sometimes the mistake is in front of us and we don’t see it..
in a big server i had a crontab to turn swap off and on again, twice a day.
with this crontab should be ok
0 6,18 * * * /path/to/your/command
but the server was dying..
because i had
* 6,18 * * * /path/to/your/command
it took me 2 days to figure out why
keep up the good work anyway