Bug ID 600492: NTLMv2 WebSSO to backend fails if username contains Greek small letter final sigma (?)

Last Modified: Oct 22, 2025

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

Known Affected Versions:
13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3, 13.0.1, 13.1.0, 13.1.0.1, 13.1.0.2, 13.1.0.3, 13.1.0.4, 13.1.0.5, 13.1.0.6, 13.1.0.7, 13.1.0.8, 13.1.1, 13.1.1.2, 13.1.1.3, 13.1.1.4, 13.1.1.5, 13.1.3, 13.1.3.1, 13.1.3.2, 13.1.3.3, 13.1.3.4, 13.1.3.5, 13.1.3.6, 13.1.4, 13.1.4.1, 13.1.5, 13.1.5.1

Opened: Jun 21, 2016

Severity: 4-Minor

Symptoms

NTLMv2 WebSSO to backend fails if username contains Greek small letter final sigma (?)

Impact

User with Greek small final sigma in the username cannot logon automatically to the RDP backend.

Conditions

Non-ASCII username containing Greek letter ? (http://www.charbase.com/03c2-unicode-greek-small-letter-final-sigma) causes SSO to the backend to fail.

Workaround

User has to re-enter credentials again manually.

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips