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KB44479 - "Nfqueue is full and dropping packets. (kernel) critical." event is seen on Pulse Connect Secure 9.1R5 with a noticeable performance impact (i.e. high cpu usage)

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Last Modified Date6/9/2020 11:47 PM
Synopsis

"Nfqueue is full and dropping packets. (kernel) critical." event is seen on Pulse Connect Secure 9.1R5 with a noticeable performance impact (i.e. high cpu usage)

This article describes an issue where "Nfqueue is full and dropping packets. (kernel) critical." event is seen on Pulse Connect Secure 9.1R5 with a noticeable performance impact (i.e. high cpu usage).
Problem or Goal
NFQUEUE is a kernel and user mode module for managing network packets in iptables.  The following event is seen along with a noticeable impact on system resources especially on PCS 9.1R5 and in some rare cases may show up on any PCS version from 9.0R1 onwards as well.
 
2020-05-12 01:31:40 - PSA7000 - [127.0.0.1] System()[] - Nfqueue is full and dropping packets. (kernel).

This issue is known to occur on PCS versions that support FQDN ACLs irrespective of it being configured or not.

This feature to configure "FQDN Resources" under Users -> Resource Policies -> VPN Tunneling Access Control, was introduced in Pulse Connect Secure 9.0R1. 
Cause
The issue is occurs with Pulse Connect Secure 9.1R5 as the maximum supported FQDN length does not meet RFC requirements. 
Solution
To resolve this problem, Pulse Secure strongly advises to upgrade to PCS 9.1R6 and above which is now available for download via https://my.pulsesecure.net/

 
Note : 
  • If the issue is still seen, please upgrade to PCS 9.1R7 or above where FQDN ACL feature is disabled by Default. 
  • Please ensure that there is no DNS latency/Delay in your network if you use this feature as this may lead to performance issues.
Related Links
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Created ByRaghu Kumar

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