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I was doing as I usually do.. I requested a certificate via Let's Encrypt, and then I clicked the "Copy to Webmin" button, but something appeared to happen, like packet loss.. now webmin does not start up.
service webmin restart
Stopping Webmin server in /usr/libexec/webmin
Starting Webmin server in /usr/libexec/webmin
Failed to open SSL key /etc/webmin/domain.tld.key at /usr/libexec/webmin/miniserv.pl line 4403.
I have verified the key file exists, but I still receive this error.