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Hi, If you have followed the step in the user guide (Configuring ASA and FWSM Devices for Event Management), I don't know why you can't see the events. Have you used a packet capture on your CSM server to check you indeed recieved the syslog messages...
Cisco IOS router are not supported with Event Manager :http://www.cisco.com/c/en/us/td/docs/security/security_management/cisco_security_manager/security_manager/4-5/compatibility/information/csmsd450.html