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Thursday, April 7, 2011

Online Open Port Check Tool

The RCCB / Residual Current Device in my place has a nasty habit of tripping whenever the house is vacant for more than a couple of days. For the remaining 99% of the time that I’m home, it never trips.  I haven’t been able to isolate exactly what triggers it, but upon my return I’m faced with a fridge/freezer full of ruined food.

Anyway, given the electricity is completely lost when this RCCB triggers, I really need a simple tool that polls my router (like a ping) to see if it responds, and if not, gives me some type of warning.

I run OpenVPN on the router over TCP port 443, and it appears the various online port scanning tools are able to detect the presence of the port being open.

The following is a list of sites that I’ve found that allow one to scan a specific remote host and port (that differs to the host/proxy of the incoming client):

My favourite is the latter, as it allows you to potentially bookmark the location; for example, to check if google port 80 open:

If anyone knows a site out there that offers remote port polling with SMS/email notification in the event the service is down, let me know!

I may have to build something otherwise on Google App Engine using the URL fetch capabilities

Here is the API

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