A VPN user is unable to connect to web resources behind the Cisco FTD device terminating the connection. While troubleshooting, the network administrator determines that the DNS responses are not getting through the Cisco FTD. What must be done to address this issue while still utilizing Snort IPS rules?
A) Uncheck the "Drop when Inline" box in the intrusion policy to allow the traffic
B) Modify the Snort rules to allow legitimate DNS traffic to the VPN users
C) Disable the intrusion rule thresholds to optimize the Snort processing
D) Decrypt the packet after the VPN flow so the DNS queries are not inspected

Question

Quizplus · Accepted Answer

The issue is likely due to Snort IPS rules blocking DNS responses. Modifying the Snort rules to allow legitimate DNS traffic will resolve the issue while still utilizing Snort IPS.

A VPN User Is Unable to Connect to Web Resources