I have a webmin/virtualmin installation with a number of virtual servers. It seems that at least on of these virtual servers cannot automatically renew the SSL certificate through let's encrypt. I haven't got any error messages (by email) and I'm not sure where to check. I've selected it to renew every 2 months (should be plenty since let's encrypt provides 90 day certs). However, for the last twice the certificated needed renewing it has expired instead of being renewed. Any ideas why this is happening? If I click "Request Certificate" manually it renews without any problems.
Let's Encrypt not renewing certificate automatically, even when option set