NSF Auto Blocking load balancer

Sany Lv1Posted 2026-May-25 12:06

Hello everyone, or any experts here, I'm having an issue with NSF at my customer. They have a load balancer that's constantly being blocked by NSF. A temporary solution is to add the load balancer's IP address to the whitelist. However, they need to secure the load balancer.

By solving this question, you may help 981 user(s).

Posting a reply earns you 2 coins. An accepted reply earns you 20 coins and another 10 coins for replying within 10 minutes. (Expired) What is Coin?

Enter your mobile phone number and company name for better service. Go

Humayun Ahmed Lv4Posted 2026-May-25 12:23
  
First Identify WHAT NSF Is Blocking
NGAF → Logs → Security Logs / NSF Logs
Muhammad Abid Lv3Posted 2026-May-25 12:40
  
If the load balancer is being continuously blocked by NSF, first check which protection policy or attack signature is triggering the block (IPS, CC attack, WAF, abnormal traffic detection, etc.).

Instead of permanently whitelisting the IP, it is recommended to:

Create a dedicated security policy for the load balancer
Adjust the relevant NSF protection thresholds/signatures
Enable trusted host or exception rules only for necessary services/ports
Verify whether health checks or high connection rates from the load balancer are triggering false positives
Update the NSF signature database and firmware to the latest recommended version


This approach helps maintain security while preventing unnecessary blocking of the load balancer.
Prosi Lv3Posted 2026-May-25 21:12
  
This only temporarily solves the problem and reduces system visibility and security protection. Identify whether NSF is classifying traffic as malicious and adjust security policies accordingly.

Suggestions: Review/Analyze Detection Logs; Create Appropriate Policy Exceptions; Secure the Load Balancer Itself; Review SSL Inspection Compatibility; Adjust IPS/WAF Policies; Consider Architectural Placement; Capture Traffic for Verification.

The best long-term solution is proper policy tuning and segmentation—not permanent full IP whitelisting.

I Can Help:

Change

Moderator on This Board

1
152
3

Started Topics

Followers

Follow

998
207
99

Started Topics

Followers

Follow

Board Leaders