we have a seriuos security issue with an ACS 3.3 server on windows running in front of an RSA ACE/Token Server 6.0. We use this setup to authenticate VPN users coming in over ASAs and VPN-3000 concentrators.
After running some time the ACS stops authenticating users. But the authentication does not fail instead the ACS allows any user to connect succesfully. We traced the communication between the ACS and the RSA ACE and found that the ACS does not talk to the RSA server anymore, but nevertheless allows the users to connect. Whats even worse - the user can supply any token code - valid or not !
In summary the ACS allows any user to succesfully connect with in invalid token codes.
After stopping and restarting the services on the ACS anything works normally.
Any help is appreciated since this is a serious issue for us.