Problem Configure Metric Server

[Dexter23]

Hi all i want to send metric server via https to an instance of influxdb that is behind a Nginx Reverse Proxy, but when i click "OK" i receive this:

from external i can reach without problem the influxdb WebUI via https://influxdb.mydomain.tld
I check via tcpdump and i not see any package sent from the proxmox to the IP of influxdb, there is a way to troubleshooting?
Thx

 

[sw-omit]

I'm not familiar with this part specifically, but I would personally start with some basic tests from the proxmox shell.
Can you ping the server by both IP and name?
Can you wget/curl the server/website and get something else then a 403/500 back?
If you do get that back, does that error-page perhaps reveal what server it is from?