Bug ID 529460: Short HTTP monitor responses can incorrectly mark virtual servers down.

Last Modified: May 29, 2024

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

Known Affected Versions:
10.2.4, 11.0.0, 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, 11.5.1 HF1, 11.6.1 HF1, 11.5.1 HF2, 11.6.1 HF2, 11.5.1 HF3, 11.5.1 HF4, 11.5.1 HF5, 11.5.1 HF6, 11.5.1 HF7, 11.5.1 HF8, 11.5.1 HF9, 11.5.1 HF10, 11.5.1 HF11, 11.5.2 HF1, 11.6.2 HF1, 11.5.3 HF1, 11.5.3 HF2, 11.5.4 HF1, 11.5.4 HF2, 11.5.4 HF3, 11.5.4 HF4, 11.1.0, 11.2.0, 11.2.1, 11.3.0, 11.4.0, 11.4.1, 11.5.0, 11.5.1, 11.5.2, 11.5.3, 11.6.0, 12.1.0 HF1, 12.1.0 HF2, 12.1.1 HF1, 12.1.1 HF2, 12.1.2 HF1, 12.1.2 HF2

Fixed In:
12.0.0, 11.6.1, 11.5.4, 11.4.1 HF10

Opened: Jun 23, 2015

Severity: 3-Major

Related Article: K17209

Symptoms

Despite successful probe response, BIG-IP DNS marks virtual server down.

Impact

Virtual servers are incorrectly marked down.

Conditions

HTTP server sends HTTP response that is shorter than 64 bytes.

Workaround

Modify server response or use a TCP monitor.

Fix Information

BIG-IP DNS HTTP/1.x monitor probe now requires 17, rather than 64 bytes of response payload, so HTTP monitor responses HTTP response that is shorter than 64 bytes no longer incorrectly mark virtual servers down.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips