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how to troubleshoot remotely if sever crashs/ hangs/ blue screen.

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Want to actually give us some details? It's kinda pointless to post such a broad question. – Jason Berg Feb 1 '11 at 7:09

You need an out-of-band management system. Most commercial servers have a facility for this; for example, HP servers are equipped with Systems Insight Manager. If you're working on a computer that doesn't have something like this built-in, you will need an IP KVM and a network attached PDU.

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Thank you very much Nic. – Anant Feb 1 '11 at 7:36
  1. Get in car

  2. Drive to data center

  3. Look at server monitor screen

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It might have helped if you'd mentioned what OS this relates to.

Since you refer to 'blue screen' I assume you mean Microsoft Windows. Unfortunately MS Windows has never been very good for remote access, nor for diagnostics/post-mortem analysis.

Any good UPS should provide remote access to power cycle the server.

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Also you could use netconsole (on linux) which allow a remote syslog daemon to record console output from your system.

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