I have the same problem, here is the info you asked for:- IM/P2P Filtering Enabled: Yes Skype Allowes: Yes, i put it in the exceptions ASTARO ASG 7.501
yes, you are absolutely right Sascha... i did configure the SOCKS proxy in ASG on port 8080, & i configure Skype to use SOCKS proxy, but still it didn't work :-(
When you using HTTP/HTTPS Proxy on Port 8080, you must configure Skype to use a Socks5 Proxy with Port 1080 (Standard Socks Port) and (additional Username/Password)
Socks Proxy definately works. Please leave socks Proxy on default port 1080. It may take a little bit longer to lskype connect as without socks proxy and direct connection. You have to restart skype after adding the socks proxy settings [:)]
I use this on many hardened ASG's, which are more or less closed from internal to external network...