user-id agent sending IP mapping with blank/no username

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user-id agent sending IP mapping with blank/no username

L3 Networker

Dear community,


I have an environment where I monitor the AD servers with Windows user-ID agents to retrieve the user-ip mappings


There are users with several AD accounts and it´s normal seeing the same IP being mapped to different usernames deppending on what resources the user gets access to.


Sometimes I see randomly in the traffic logs the username blank associated to the IPs and the deny policies are applied to this traffic. It happens like this:

Minute X: user-mapping is okay

Minute X+1: user-mapping is blank

Minute X+3: user-mapping is okay again


I checked with "show log userid ip in <IP> direction equal backward" what mapping the user-id agent are sending and I realized that when I see no-mapping or blank mapping on the traffic logs, the mapping the user-id agent is sending to the firewall associated to the IP is the machine name. Like this: domain\machine_name


Is expected the user-id agent sending the mapping in that format?


Thank you for your answers.




Community Team Member

Hi @Carracido ,


Did you know you can ignore users in User-ID ?

Generally, this is used for service accounts, but any desired username can be entered:


Hope this helps,


LIVEcommunity team member, CISSP
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