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I have an internal company server, and there are a few internal apps that are hosted on it.

The problem is that the connection is not very stable, so I want to know how is the connection in a time series manner, for how long the server has been down, at what period of time the server is down, that kind of information.

To be more specific, I want to know whether a particular port on that server is accessible, because the app requires a dedicated port to communicate with the rest of the clients in the network.

Edit: Note that the port and the app is only accessible from the intranet.

Is there any software/ web apps that do this?

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There are plenty of them, dependent upon the service/application you want to monitor. Do you just want to know if the server is alive and accessible or do you have more complex needs? –  joeqwerty May 20 '11 at 3:15
    
@joeqwerty, I want to know whether a particular port on that server is accessible, because the app requires a dedicated port to communicate with the rest of the clients in the network. –  Graviton May 20 '11 at 3:18

1 Answer 1

Here are just a few of the many that offer external monitoring for standard or custom ports:

http://www.serviceuptime.com/free_monitoring.php

http://www.siteuptime.com/

http://www.remotemonitoringservices.com/monitor_overview.php

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Hmm, seems to me that they are all dealing with internet apps. What about intranet apps? My apps are not accessible from the outside. –  Graviton May 20 '11 at 3:35
    
In that case: serverscheck.com/monitoring_software. nagios.org. poweradmin.com/ServerMonitor. and a billion more results at google: google.com/… –  joeqwerty May 20 '11 at 3:43

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