Last Modified: Sep 02, 2026
Affected Product(s):
BIG-IP APM
Fixed In:
21.1.0.2, 17.5.1.9, 17.1.3.5
Opened: Jan 19, 2026 Severity: 3-Major
Following message is seen in /var/log/apm . Dec 11 04:42:01 <example.com> err nlad[xxxx]: xxxxxxx:3: <0xxxxxx> client[109]: DC[x.x.x.x]: schannel[x]: STL exception: eventfd_select_interrupter: Too many open files
When NLAD exhausts its file descriptors, NTLM user authentication fails.
Occurs when there are frequent changes to the NTLM configuration while active user sessions are using the current configuration.
Restarting TMM with bigstart should resolve the issue.
None