Dragon is correct. Apache can be overload due many issues (ie overly
popular site or DoS attack, etc.) but the system will still ping and
respond to other ports and services. Apache will hit the limit and
not respond to http request, which is good, to prevent your system
from DoS or crash.
There are some firewalls that can detect and thwart some DoS attacks
which you can research on your own for if you wish.
Frank
Arnab Ganguly did speak thusly:
Hi All,
Is it possible that Apache server stops responding under heavy
load, but it responds to ping? What would be the possible causes
for this?
Remote client is getting connection refused when it tries to
connect.But when the I ping the server from the client box it shows
the server is alive.
Thanks
-A
---------------- End original message. ---------------------
Yes, a machine can indeed respond to a ping (ICMP echo request)
while another application is not responding.
Apache can get completely bogged down by a large number of requests
but the ICMP mechanism is built into the TCP/IP stack in the OS and
takes very little in the way of processor or time resources to
implement. As far as I know, all modern OS platforms on which Apache
runs are multitasking with a preemptive scheduler which means each
application gets some share of the processor time on a periodic
basis. So it is entirely possible that it will continue to work
while Apache is overloaded.
Dragon
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