Centos 5.4 Crashed for no reason. How do I find out why?

My server crashed last night and I don't know why. Could somebody talk me through the server log interrogation process?
AdrianSmithUKAsked:
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fosiul01Commented:
you can have a look to

/var/log/messages

/var/log/kernel

dmesg

this 3 places all log will go


get the time of crash
from

last commnd

then look those logs around that time




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Monis MontherSystem ArchitectCommented:
What do you mean by crashed? Did not boot ? a service crashed?
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AdrianSmithUKAuthor Commented:
It stopped working for 8 hours or so and then came back online. I asked the ISP if there was a service outage but there wasn't. The server stopped responding to SSH, FTP and HTTP/HTTPS.
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fosiul01Commented:
It stopped working for 8 hours  : was it shut-down ???


did you had to reboot the server ??



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AdrianSmithUKAuthor Commented:
Many thanks. The logs seem to be normal and people accessed the server using different ISPs when to me it was down. Therefore I deduce that this was an ISP routing  problem.
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