Use an authorized administrator on a self-managed server. Inventory application rewrites, .htaccess rules, PHP handlers, custom virtual hosts and caching. Keep recoverable backups and test the target stack on a representative nonproduction server.

1. Inspect the current webserver CustomBuild option and supported values with da build opt_help.
2. Choose Apache when applications depend on its configuration model, or assess nginx with Apache when a reverse-proxy arrangement fits. A standalone nginx setup requires explicit handling of Apache rewrite and access rules.
3. Review memory requirements and handler compatibility. Do not assume a commercial LiteSpeed configuration and OpenLiteSpeed behave identically if evaluating those alternatives.
4. Use the current vendor-documented sequence to set the target webserver option, build the selected service, build compatible PHP where required and rewrite configuration. Perform this in a scheduled maintenance window.
5. Test representative domains and custom directives before declaring the change complete. Keep the original configuration and a practical return-to-service plan.

Check redirects, protected directories, static downloads, PHP requests and application routing. Measure errors and resource use under comparable load. Confirm certificate handling and customer configuration controls still behave as intended.

If an application breaks, identify whether the cause is a missing rewrite, different static-file handling or runtime mismatch. Do not delete .htaccess files or disable security to make the symptom disappear. Revert through the supported stack configuration if compatibility cannot be established, recognizing that service rebuilds and restarts need a controlled recovery window.

• Reviewing and changing CustomBuild options
• Making persistent per-domain web-server changes in DirectAdmin
• When to rebuild DirectAdmin web-server configuration
• Adding a PHP extension through DirectAdmin CustomBuild
• Creating and testing a DirectAdmin cron job

• DirectAdmin: Web Services
• DirectAdmin: Customizing Nginx Apache