We have ASA 5520 which we connect to using ASDM 6.0. We authenticate via an ACS.
Lately we've been having situations where we're able to open the ASDM login page, but when you type your username and password the ASA rejects it.
Same happens when you try to log in using Telnet.
We would usually reload the ASA and then connect to the device using Telnet which now accepts the username and password (after the reload). We then have to reconfigure the http commands (http 10.1.5.7 255.255.255.255 inside etc) and then log in using asdm and the ASA now accepts the username and password.
Any ideas why this is happening and what we could do to solve it?
Thanks in advance!