TCP error

[mikula mali]

I have monit setup to check on our Apache (v 2.2.3) and a couple of other 
resources with 2min cycles. The problem is that monit reports strange HTTP 
error very frequently (avery hour or so) although the apache seems to be 
very healthy as I can see from apache logs -- basically there's no 
interruption of traffic to the outside world. Then after a couple of 
minutes, things seem to fix on their own (ie. monit doesnt report an error).

Here's my monit error:

> > 'apache' failed, cannot open a connection to INET[www.ipetitions.com:80] 
> > via TCP

and the entry in monitrc to check on apache is as follows (running on 
myserver.com machine):
> >
 if failed host www.myserver.com port 80 protocol http
      and request "/monit_token"
      with timeout 30 seconds
      for 3 times within 5 cycles
      then restart
> >

So it is NOT http protocol that fails... monit simply fails to open a TCP 
port I guess. When there's a success, the following two lines are in the 
log:
> > 'apache' succeeded connecting to INET[www.myserver.com:80] via TCP
> > 'apache' succeeded testing protocol [HTTP] at INET[www.myserver.com:80] 
> > via TCP

Does anyone have a clue what might be the problem here? Maybe something to 
do with TCP stack and not monit itself? I'm running this on 
RHEL4/Centos4_x64 system. We get decent traffic (5k hits daily), but nothing 
too bad and average cpu loads on the server are about 0.1 or so...

-mike

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