George V. Reilly's Technical Blog

Skype and SSL

A year ago, I ran into a problem with Skype squatting on port 80, which I had long forgotten about. Today, I ran into one with Skype squatting on port 443.

I was trying to set up SSL on my Windows Server 2003 dev box. My ultimate goal is to experiment with client certs and server certs for SOAP, but that's a story for another time. I was running into all kinds of strange problems, exacerbated by the relatively strange IIS configuration on my machine.

I tried SslDiag. In hindsight, it pointed me towards the underlying problem, but I couldn't see it at the time. I did a lot of digging around on Google. Eventually, a newsgroup thread on ListenOnlyList gave me CurrPorts, which showed me that Skype was listening on port 443. I suppose netstat -anob, TcpView, or Port Reporter would have told me the same thing, though CurrPorts had the friendliest view. WFetch from the IIS 6 Resource Kit Tools was also useful in looking at raw requests and responses.

Comments

smelliot said:

Sysinternals (the guy who found the sony DRM kit) has a taskmanager replacement called ProcessExplorer that allows you to see which ports any process on your system has open.

So a few days ago, I noticed network activity that shouldn't have been and was able to track it down to a particular process and found a attempt to crack my main box...

Here's the link to it:
http://www.sysinternals.com/utilities/processexplorer.html
# November 21, 2005 5:33 PM

George V. Reilly said:

I've been a Mark Russinovich fan for years. Note the link to his TcpView above.

Process Explorer can show you which ports a particular process has open (and much other good stuff), but I don't see how it shows, in one go, all the stuff listening on all ports.
# November 23, 2005 12:01 AM

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# March 28, 2010 4:47 AM

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# March 13, 2012 9:10 AM
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