I made this very simple environmet for testing purpuse but I can't get it work... I have a cisco 1750 router with IOS 12.1(5)IB4 and configured it to access a radius server made with phpRADmin livecd (fedora5+freeradius) On the cisco I configured: radius-server host ipmyradius auth-port 1812 acct-port 1813 and the other aaa commands needed If I look at the radius.log file I always see Error: Ignoring request from unknown client ipmycisco:1645 The Cisco router keeps always trying to connect to radius using port 1645 even if I specified to use 1812... I have tried to configure radius server to listen on port 1645 but is the same. Obviously the shared key is the same on both sides. I even tried with a clean installation of freeradius on a plain debian but I get the same error in the logs... The microsoft radius integration(server 2003) worked at first try with this cisco config... Please any help?