Last Modified: May 12, 2026
Affected Product(s):
F5OS F5OS-A, F5OS-C
Known Affected Versions:
F5OS-A 1.8.0, F5OS-A 1.8.1, F5OS-A 1.8.2, F5OS-A 1.8.3, F5OS-C 1.6.0, F5OS-C 1.6.1, F5OS-C 1.6.2, F5OS-C 1.6.4, F5OS-C 1.8.0
Fixed In:
F5OS-C 1.8.1
Opened: May 17, 2024 Severity: 3-Major
The first time a remote user attempts to log in to a system, the access is denied despite providing the correct credentials. This is true for both TACACS and RADIUS remote users.
The first login fails. Subsequent remote login attempts succeed with proper credentials.
This always happens. A way to simulate the first login is to delete the file /etc/libnss-udr/passwd.
Attempt remote login again.
The user can now log in with proper credentials on the first attempt. Note that the fix involves having the following version of OpenSSH (or newer): # rpm -q openssh openssh-7.4p1-21.F5.6.2.7.el7.x86_64