If you see a TLS/SSL certificate when starting (or installing) the connector, it usually indicates there is a SSL-inspecting firewall on site.

If you have a openssl installed, you can run this command:

openssl s_client -showcerts -servername auth.__MYDOMAIN__ -connect auth.__MYDOMAIN__:443

It should emit something like below, note the ISRG Root X1 and the Let’s Encrypt.

root@rtr:~# openssl s_client -showcerts -servername auth.agilicus.com -connect auth.agilicus.com:443