Windows User-ID agent fails
to perform periodic probing at the configured interval, which results
in a temporary loss of IP address-to-username mapping on the firewall
until the next probe is complete.
the probing interval to a multiple of 51 seconds.
After receiving machine account
names in UPN format from a Windows-based User-ID agent, the firewall
misidentifies them as user accounts and overrides usernames with
machine names in IP address-to-username mappings.