How do you enable debug mode on a Zimbra server for vulnerability research?

To enable debug mode, stop the Zimbra service with 'zmcontrol stop', replace the zmmailboxdmgr script with the unrestricted version, add Java debug options via 'zmlocalconfig -e mailboxd_java_options' including JDWP agent settings (e.g., address=*:8000), disable the firewall (ufw disable), and restart the server. This allows remote debugging of Zimbra's Java components. --- **Related reading:** - [Setting up Zimbra Vulnerability Debugging Environment](/news/setting-up-zimbra-vulnerability-debugging-environment) — original article - [Penetration Techniques - Lateral Movement via WSUS](/news/penetration-techniques-lateral-movement-via-wsus) - [Penetration Techniques - Clearing Single Records in RecentFileCache.bcf and Amcache.hve](/news/penetration-techniques-clearing-single-records-in-recentfilecache-bcf-and-amcache-hve) - [ProxyShell Exploitation Analysis 2 - CVE-2021-34523](/news/proxyshell-exploitation-analysis-2-cve-2021-34523)