Bug ID 551315: HTTP's handling of early server response might cause NTLM authentication failure.

Last Modified: Jul 12, 2023

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

Known Affected Versions:

Fixed In:
10.2.4 HF13

Opened: Oct 07, 2015

Severity: 3-Major

Related Article: K36390254


Using the HTTP filter, NTLM authentication might fail if an early server response is received.


User cannot upload attachment to backend server using NTLM auth.


Using TMOS v10.2.4 HF12: If the system is in the middle of sending the request body to server, and at this time the server responds (with the response header) without waiting for the entire request body to arrive, this is considered as an early server response.


None known.

Fix Information

This bug is present only in TMOS v10.2.4 HF12. The behavior is now the same as later versions of the software.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips