Bug ID 647165: A monitor may unexpectedly transition from up to down and back to up.

Last Modified: Jul 13, 2024

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

Known Affected Versions:
11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4, 11.6.0 HF5, 11.6.0 HF6, 11.6.0 HF7, 11.6.0 HF8, 11.6.1, 11.6.1 HF1, 11.6.1 HF2, 11.6.2, 11.6.2 HF1, 12.0.0, 12.0.0 HF1, 12.0.0 HF2, 12.0.0 HF3, 12.0.0 HF4

Fixed In:
11.6.3

Opened: Feb 23, 2017

Severity: 3-Major

Symptoms

A pool member or node monitor may unexpectedly transition from up to down and back to up even though the pool member or node has not failed.

Impact

BIG-IP system might send a premature FIN on the connection. This might result in unexpected monitor flapping even though the monitored object has not failed.

Conditions

One or more of FTP, IMAP, POP3, or SMTP monitors are in use. This might also occur with monitor types other than those listed.

Workaround

None.

Fix Information

BIG-IP system no longer sends a premature FIN on the connection, so unexpected monitor flapping no longer occurs, in this case.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips