Re: Allow Skype
- From: "A. Klimkin" <nothanks at microsoft.com>
- Date: Tue, 1 Aug 2006 14:25:08 +0400
"Newbie" <Newbie@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:BF7D3147-3F52-47B4-A4CA-A8777F277D89@xxxxxxxxxxxxxxxx
Hello,
If I allow http and https to external, then I can use Skype no porblem at
all.
If I limited http and htpps to some sites(including skype.com), then I can
not login Skype.
Can I fix this problem?
The short answer is:
No. Because Skype client program calls skype.com for its binary updates
only.
To make Skype communications work you should allow Skype client program to
contact a set of another external sites called "super nodes". You have to
allow them as long as skype.com
Some boring details:
Skype client builds a list of available super nodes dynamically, but there
is a list of 7 or 8 of them are hardcoded into the Skype client binary, so
[theoretically] you can monitor, which sites Skype client is trying to
contact and allow them accordingly.
Because Skype client is using proprietary protocols, it is very hard to
suggest anything more particular in this case. You could also want to read
reports regarding Skype protocol research made by some enthusiasts. Here is
an example:
An Analysis of the Skype Peer-to-Peer Internet Telephony Protocol by Salman
A. Baset and Henning Schulzrinne (Skype v1.4)
http://www1.cs.columbia.edu/~salman/publications/skype1_4.pdf
Regards,
Andrew
.
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