This problem occurs due to the presence of Cisco bug ID CSCsd40764.
With this error, the CiscoSecure ACS Solution Engine ceases to authenticate users. Error logs show events similar to this:
AUTH 02/13/2006 11:44:46 I 5081 0704 Done RQ1040, client 2, status 0
AUTH 02/13/2006 11:44:46 S 5100 0640 Listening for new TCP connection --------
AUTH 02/13/2006 11:44:46 E 5103 0640 AllocateThread returned -1 AUTH 02/13/2006 11:44:46 E 5103 0640 Too busy to handle connection attempt 253
The Too busy to handle connection attempt error message is displayed until the service is re-started. When the errors occur, no authentication attempts succeed. This issue is seen in environments where the CiscoSecure ACS Solution Engine authenticates to a remote agent. It is possible for the remote agent to tie up CSAuth authentication attempts. This is found in CiscoSecure ACS Solution Engine versions 4.0, and 3.3(3).
As a workaround, perform either of these steps:
- Reload the CiscoSecure ACS solution engine.
- Reset the CSAuth service when the problem is observed.
Too busy to handle connection attempt
Cisco Secure Access Control Server (ACS)
ACS Solution Engine Software version 3.3