All versions of Carbon Black.
An OS-level proxy will prevent regularly scheduled tasks used to manage the Carbon Black server from executing as as designed.
This will vary, but a common symptom is performance issues due to the purge cronjob not executing.
You can verify if an OS-level proxy is configured by running the below commands on your Carbon Black server (and all minions, if applicable).
set | grep -i proxy
printenv | grep -i proxy
If a proxy is configured, please work with your System Administrator to disable the proxy.
To configure a proxy for Alliance server or YUM connectivity, please review our How to configure a web proxy document.