The agent it installed on Centos 7.7 and is version 7.1.503.0. It was installed from the RPM presented on the ESET downloads page.
The error occurs during configuration, when running the agent-linux-x68_64.sh command.
$sudo bash agent-linux-x86_64.sh --hostname=redacted.domain.com --port=2222 --webconsole-port=2223 --webconsole-user=redactedUsername --webconsole-password=redactedPassword
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Creating 'install' directory path: /opt/eset/RemoteAdministrator/Agent
Creating 'config' directory path: /etc/opt/eset/RemoteAdministrator/Agent
Creating 'data' directory path: /var/opt/eset/RemoteAdministrator/Agent
Creating 'Pki Cache' directory path: /var/opt/eset/RemoteAdministrator/Agent/pki.eset.com/
Creating 'logs' directory path: /var/log/eset/RemoteAdministrator/Agent
Creating 'libs' directory path: /opt/eset/RemoteAdministrator/Agent
The archive will be extracted to: /opt/eset/RemoteAdministrator/Agent
Extracting, please wait...
Checking OpenSSL ... done [OpenSSL 1.0.2k-fips 26 Jan 2017]
Checking installed version ...
Status of current installation is: NEW
New connection settings are 'hostname': 'redacted.domain.com', 'port': 2222
Getting certificate from server...
It is not possible to connect to the ESET Security Management Center Server.
Cleaning up setup directories