Cisco IPS-4255-K9 - Intrusion Protection Sys 4255 Installation Manual page 10

Contents
Time and the Sensor
Advantages and Restrictions of Virtualization
Supported MIBs
When to Disable Anomaly Detection
Troubleshooting Global Correlation
Analysis Engine Not Responding
Troubleshooting External Product Interfaces
Troubleshooting the Appliance
Cisco Intrusion Prevention System Appliance and Module Installation Guide for IPS 7.0
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Recovering the NME IPS Password
Disabling Password Recovery
Verifying the State of Password Recovery
Troubleshooting Password Recovery
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Time Sources and the Sensor
Synchronizing IPS Module Clocks with Parent Device Clocks
Verifying the Sensor is Synchronized with the NTP Server
Correcting Time on the Sensor
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External Product Interfaces Issues
External Product Interfaces Troubleshooting Tips
Hardware Bypass and Link Changes and Drops
Troubleshooting Loose Connections
Analysis Engine is Busy
A-25
Connecting the IPS 4240 to a Cisco 7200 Series Router
Communication Problems
Cannot Access the Sensor CLI Through Telnet or SSH
Correcting a Misconfigured Access List
Duplicate IP Address Shuts Interface Down
SensorApp and Alerting
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SensorApp Not Running
Physical Connectivity, SPAN, or VACL Port Issue
Unable to See Alerts
Sensor Not Seeing Packets
Cleaning Up a Corrupted SensorApp Configuration
Blocking
A-37
Troubleshooting Blocking
Verifying ARC is Running
Verifying ARC Connections are Active
Device Access Issues
Verifying the Interfaces and Directions on the Network Device
Enabling SSH Connections to the Network Device
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