Bug ID 1382181: BIG-IP resets only server-side on idle timeout when used FastL4 profile with loose-* settings enabled

Last Modified: Jun 21, 2024

Affected Product(s):
BIG-IP LTM(all modules)

Known Affected Versions:
17.1.0,,,, 17.1.1,,,

Opened: Oct 20, 2023

Severity: 3-Major


After upgrading to BIG-IP 17.1.0, observed that some of the client sessions are orphaned, this has caused multiple intermittent connection failures when connecting through BIG-IP. When the FastL4 profile with loose-* settings enabled is used and an idle timeout of 300 seconds, after idle time of 300 seconds, the server-side connection resets but no reset is sent towards client.


Some client sessions will be orphaned and cause intermittent connection failures when trying to connect through BIG-IP.


- Use BIG-IP version 17.1.0 and above - Use Fastl4 profile with loose-* settings enabled. - Configure idle timeout values.


If not required for a particular use case, then disable loose-close settings in Fastl4 profile.

Fix Information


Behavior Change

Guides & references

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