1Backup
Save the old file
Keep your current serverconfig.xml and save folder before you test a new config.
Build a serverconfig.xml draft, copy the XML, download the file, and test before replacing live settings.
Server Settings
Choose settings, copy the XML, and test before replacing a live server file.
Output
Next
Server settings affect joining, EAC, performance, world rules, and player trust. Change one thing at a time.
Keep your current serverconfig.xml and save folder before you test a new config.
Post the new version, EAC, world seed, password, required MODs, and restart time before reopening.