I2 Siemens DirX Access RP with openinfocard

From OSIS Open Source Identity Systems

I can not access this RP through my VPN connection because my company's FW/proxy is prohibids this port number.

Forbidden
You were denied access because:

Access denied by access control list. 

Tested by Axel Nennker with

• Firefox 2.0.0.8
• xmldap-0.9.8.20071017.xpi openinfocard id selector
• IdentitySelector.xpi (1.0.1) IdentitySelector.xpi
• (Windows XP SP2)