Bug ID 1983245: After upgrading from version 16.1.5.2 to 17.5.0, BIG-IP TMUI returns a 401 Unauthorized error when configured with Certificate-LDAP authentication.

Last Modified: Jul 09, 2026

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

Known Affected Versions:
17.5.0, 17.5.1, 17.5.1.2, 17.5.1.3, 17.5.1.4, 17.5.1.5, 17.5.1.6

Opened: Jul 15, 2025

Severity: 3-Major

Symptoms

After upgrading BIG-IP from version 16.1.5.2 to 17.5.0, TMUI login fails with a 401 Unauthorised error when Certificate-LDAP (auth cert-ldap) is configured as the authentication source.

Impact

TMUI login fails for users authenticating via Certificate-LDAP.

Conditions

1. BIG-IP upgraded from 16.1.5.2 to 17.5.0 2. System authentication source is set to Certificate-LDAP

Workaround

None

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips