I have several ISPConfig boxes in production and LetsEncrypt works well on all of them except one. It was working properly, but at some point in the last three months, certificates stopped renewing properly. The LetsEncrypt log shows a few lines saying that certbot was referenced, but ISPConfig doesn't seem to be initiating the certbot process. The box in question is: - Ubuntu 20.04 - ISPConfig 3.2.5 - PHP7.4.20 - Certbot 0.40.0 from the Ubuntu Repo When the LetsEncrypt box is checked in the ISPConfig GUI, this is the output in /var/log/letsencrypyt/letsencrypt.log: Code: 2021-06-30 10:34:01,954:DEBUG:certbot.main:certbot version: 0.40.0 2021-06-30 10:34:01,954:DEBUG:certbot.main:Arguments: ['--domains', 'testbox.example.org'] 2021-06-30 10:34:01,954:DEBUG:certbot.main:Discovered plugins: PluginsRegistry(PluginEntryPoint#manual,PluginEntryPoint#null,PluginEntryPoint#standalone,PluginEntryPoint#webroot) 2021-06-30 10:34:01,961:DEBUG:certbot.log:Root logging level set at 20 2021-06-30 10:34:01,961:INFO:certbot.log:Saving debug log to /var/log/letsencrypt/letsencrypt.log On my other ISPConfig boxes, this section is followed by responses showing certbot activity. On this ISPConfig box, there is no other information written to the log. I have 'apt remove --purge certbot' and reinstalled. No difference. I have 'ispconfig_upate.sh --force', but that hasn't helped either. The 'Server Config - Web - Skip Lets Encrypt Check' box is checked. Thank you for your help.