Alert even if server is up-and-running

[stlecho]

Hi,

Although my monitored servers are continuously up-and-running, I'm receiving quite often the following alert message: "We have not received any data from ...".

Based on which criteria does Java-monitor decides to send the above alert message ?

Regards, Stefan Lecho.

[kjkoster]

Dear Stefan,

The probe sends data to the server and the server uses the timestamp on the last push to the Java-monitor server to determine if the host is off-line or not.

You may receive a false positive for a number of reasons:

Your network may hickup.
Your local DNS server may hickup.
My network may hickup.
My DNS server may hickup.
Java-monitor is being restarted for an upgrade. (this should not happen, but sometimes e-mails do escape because of human error).


I'm working to make the number of false positives go down, because I feel that they are making Java-monitor less useful. One of the things I am doing is that we will be moving to a high-quality data center, instead of the budget hosting that I use now. We should move in a few weeks. This should make network and DNS problems on the side of Java-monitor a thing of the past.

There are also feature requests to buffer DNS lookups to make the hickups have less effect.

Until all these are in place, you can set Java-monitor to send you e-mail only after no data has been received for 20 minutes. This will give the probe a chance to recover.

Does this answer your question?

Kees Jan