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Server hangs or freezes can occur for a number of reasons;
- System Overload: Server hang-ups due to system overload typically show up as slowly loading pages. The system may respond slowly for a period and then return to normal operation. Server slowdowns typically happen at peak traffic periods, when scheduled tasks (cron jobs) run, or when certain maintenance occurs. Keeping track of the server freezes can help pinpoint what maybe happening.
- Configuration Errors: a hung server that is offline can be due to mis-configuration.
- Hardware Issues: hardware issues can result in hangs and freezes.
- Server backup: in many cases, I’ve seen backups cause servers to hang. For example, rsync, used on cPanel and many custom scripts, consumes a significant amount ofCPU resources which can slow your server and even cause it to freeze up.
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