Bug ID 1053205: Fragmented SSL handshake message causes "record length too large" alert in proxy-ssl mode.

Last Modified: Jun 19, 2025

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

Known Affected Versions:
15.1.2, 15.1.2.1, 15.1.3, 15.1.3.1, 15.1.4, 15.1.4.1, 15.1.5, 15.1.5.1, 15.1.6, 15.1.6.1, 15.1.7, 15.1.8, 15.1.8.1, 15.1.8.2, 15.1.9, 15.1.9.1, 15.1.10, 15.1.10.2, 15.1.10.3, 15.1.10.4, 15.1.10.5, 15.1.10.6

Opened: Oct 07, 2021

Severity: 4-Minor

Symptoms

When a virtual server is configured as an SSL proxy and the SSL Handshake message received from a pool member is split into 2 SSL records, the SSL handshake fails with an error message "record length too large."

Impact

The SSL handshake is rejected.

Conditions

-- A BIG-IP virtual server uses Proxy-SSL mode. -- The certificate request used is 'Huge' or 'large'.

Workaround

N/A

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips