Skype: Error "No Proxies Found"

This is a very common problem while calling users through Skype from behind a firewall. I had a similar problem with Skype. My college firewall was a HTTP proxy with only 80 port allowed. The skype logs in(signs in) without any problem and also makes user-searches seamlessly. But, when you message a Skype user, you see that the message has not been delivered. Moreover, when you try to make a call to someone, after a while you get an error message saying "No Proxies Found" in red fonts in the calling tab.

Reasons for this could be one of the following:
1. The internet connection is slow, as in the bandwidth of the corporate connection is at its full usage.
2. Half open TCP/IP simultaneous connections are limited by default on Windows.

While, the first problem cannot be handled there is a solution for the second case.
By default, the number of half open TCP/IP connections are set to 10. When I did some searches on the internet I found a patch to fix this thing. I downloaded the file, executed the .exe file, and set the TCP/IP connections to more than 100.
Before you too imitate the same in order that your skype works, be aware that the limit on TCP/IP connections as 10 was set as a security reason by Windows. It seems that the more your TCP/IP connections open(anything more than 10), the faster you are prone to and can spread viruses and trojans. Since I was behind a safe network and also maintain my computer healthy -- I do update anti-virus and personal firewall, I had no issues in installing this patch.

For those who are sure of what they are doing, here's the link for the patch.

http://www.lvllord.de/

People who have no other way can try installing this patch and see if they are able to make calls through Skype behind a proxy firewall. There's no loss in trying. If Skype doesn't work even after installing the patch, it is recommended to uninstall the patch. The same .exe file is run to perform both install and uninstall.