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Belgacom is the former monopolist State owned telephone company in Belgium, and they still have a big part of the market, especially of ADSL internet connections. And although the logos of Skype and Belgacom have almost the same color, I don't think they love each other.
I got a very disturbing e-mail this morning. I translate it from Dutch:
"Dear customer,
To provide your internet connection with the most optimal protection against viruses, hackers, etc. Belgacom takes continuously a lot of protective actions. Therefore, from Monday November 30 on, we implement a major protection intervention on our network: TCP-ports 80, 23 and 443 will be closed for all external traffic towards your network (incoming sessions …)
If you use your internet connection simply to surf or to mail, then you will not notice anything and you don’t need to continue to read.
Only some very specific applications (like web servers) will not work anymore."
And then they give instruction how to unblock the ports!
(The red marked text above is their "marking").
So, will my Skype still work? Technical people know that Skype uses the ports 80 and 443. I am curious, and am awaiting Monday 30 to see what happens. I’ll give feedback for sure.
And of course, there is a workaround, but …
[Feedback November 30: it still works!]