Last Modified: Aug 19, 2026
Affected Product(s):
BIG-IP (all modules)
Known Affected Versions:
11.5.1, 11.5.1 hf1, 11.5.1 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, 11.6.0, 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, 11.6.3, 11.6.3.1, 11.6.3.2, 11.6.3.3, 11.6.3.4, 11.6.4, 11.6.5, 11.6.5.1, 11.6.5.2, 11.6.5.3
Fixed In:
12.0.0, 11.5.2
Opened: Oct 01, 2014 Severity: 3-Major
When a BIG-IP system has an APM Limited license, NTLM is silently disabled and the connection goes through. This breaks many (all) use-cases for Exchange + APM.
Exchange cannot be used with APM Limited license when NTLM frontend authentication is selected, which is used in essentially all APM + Exchange deployments.
APM and Exchange are deployed together with APM Limited / Lite license.
None
The NTLM frontend authentication (ECA) feature can now be used with an APM Limited license. Typically, this is for Exchange deployments.