ERA6 does not recognize computers (El ERA6 no reconoce las computadores)

[MRTI 0]

Buenas tardes.
Panorama:
Tengo 30 PCs, El ERA6 me reconoce solamente 25 PCs, los otros no son visibles. Que puedo hacer en este caso?
Cabe recalcar que ya cada PC tiene su agente instalado y esta agregada a dominio. 
Muchas gracias.

Machine translation:
I have 30 PCs, The ERA6 recognizes me only 25 PCs, the others are not visible. What can I do in this case?
It should be noted that each PC already has its agent installed and is added to the domain.

Edited January 8, 2018 by Marcos
Machine translation added

[Marcos 5,731]

Check C:\ProgramData\ESET\RemoteAdministrator\Agent\EraAgentApplicationData\Logs\status.html for a list of issues on the troublesome machines.

Also we kindly ask you to post in English since this is an English forum and most of moderators and users may not be able to understand and help if you post in another language.