With RADIUS authentication requests, the Real Time Authentication Monitor may show no entry for several reasons, so check the RADIUS Client statistics to look for rejects in Authentication Manager 7.1, 8.0 and 8.1.

Authentication requests are silently discarded, or dropped, with nothing displayed in the Real Time Authentication Monitor or Authentication Activity Report.

Running tcpdump, Wireshark or sniffer network packet capture shows authentication requests set from the agent on 5500 UDP,  but there are no replies coming back out of the Authentication Manager server. 

See article000049426 - Using tcpdump to troubleshoot authentication issues with RSA Authentication Manager 8.x  for instructions using the tcp dump command.

Following the steps in the article, run the command ./tcpdump -i eth0 -s 1514 -Z root  port 5500.  

In addition, proof of a silent discards will be seen in the /opt/rsa/am/server/logs/imsTrace.log   

If logging is set to verbose, (see 000053729 - How to turn on/off verbose offline authentication logging), the source IP address of the unknown agent will be listed as an error.  For example,
 

2014-03-07 09:55:21,121, [[ACTIVE] ExecuteThread: '0' for queue: 'weblogic.kernel.Default (self-tuning)'], (AgentAccessSQL.java:130), 
trace.com.rsa.authmgr.internal.admin.common.dal.sql.DataObjectAccessSql, 
ERROR, PACEC81.credito.bcp.com.pe,,,,Unable to lookup class 
com.rsa.authmgr.internal.admin.agentmgt.dal.Agentwith ip address: 192.168.1.5

1. The IP address is correct.
2. The agent is not disabled
3. The gent name is spelled correctly.  Compare with reverse DNS lookup of the IP address.  If nslookup <IP_address> returns a name different then what is listed for the agent, either fix name resolution or change the name in the Security Console.
4. You may need to delete and re-create the agent.
5. If this is a RADIUS client, you may need to regenerate the node secret for the RADIUS server entry, or the RADIUS client's associated agent.  RADIUS silent discards can be seen in RADIUS client statistics.