Passive service checks on windows via NAT

[James Hailstone]

Hi there, was wondering if anyone has any advice or can help me with
the following.

I work for an IT outsourcing company, we have numerous clients located
at many different remote sites (all are running windows servers). We
are looking to implement nagios as a way of monitoring certain
services on remote hosts, ie exchange server services, sql, memory,
disk use, etc.

I have setup a nagios test server in our office which is doing active
checks via nrpe_nt. This works really well and is exactly what we want
to implement across the range of our clients.

My problem is as follows. Most of our clients are behind firewalls
which are providing NAT to the outside world. I can therefore setup
nrpe_nt to check one remote server (creating a rule on the remote
firewall so that incoming port 5666 gets forwarded to the nt server to
be checked). However, this obviously won't work if the client site has
two or more windows servers. VPN is out of the question, as well as
setting up a remote nagios box at the client site.

My impression is that the checks will need to be run passively from
the windows boxes themselves using nsca. So my question is:

Can i get the checks/functionality of nrpe_nt passively ?. That is,
can the nrpe_nt service be told to send data back to the nagios server
without first receiving an active trigger from nagios ?. If this isn't
possible, does anybody know of any way to do passive checks from
windows boxes ?.

Any help would be greatly appreciated, as i'm now having recurring
dreams about passive/active, and nrpe, and nsca ! :-)

Thanks in advance

James


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