- Server will not start: the first five checksNinety percent of "it won't start" tickets end at one of these five. Do them in order.
- Out of memory: understand and fix itHow to tell that RAM is the problem, what eats it, and the order of fixes from free to upgrade.
- "Port already in use"What the error means on a container host, the two real causes, and how to clear them.
- Read crash logs and find the right linelatest.log, crash-reports, debug logs: which file to open and how to find the one line that matters.
- The server runs but nobody can joinWhen the console says "Done" but players see errors: the checks that find the cause in two minutes.
- File broken after uploadZero-byte files, corrupt jars and worlds after an upload: what went wrong and how to redo it safely.
- When a ticket is the right move and what to put in itWhat Kowalski and the guides cover, what only we can do, and the four things a good ticket contains.