We have been using Skype for most of our conversation for many years, behind ISA firewall 2006 with clients having firewall client installed.
Suddenly almost a month ago, something strange has happened and all of our clients are unbale to connect to Skype, I even tried to create an Allow All rule from internet > external for all protocols but even that is not allowing the Skype to login.
I am really stucked here, uninstalled all Antivirus/Antispyware products from clients PC's(just for testing whether they are culprit)but nothing worked! also went into the forums of Skype but there is no update regarding any new thing! also all clients are running the latest version of Skype.
Can you please take this issue and let me know the possible cause!