Agent cannot be authenticated by server

Agent cannot be authenticated by server

PMP is installed on Windows Server 2012 R2. Before changing the Admin password, the agent connected and retrieved a list of users from the DomainController. Now there is an error in the logs:

 ::: Thu Jun 10 15:50:14 2021 ::: Going to Authenticate this Agent
::: Thu Jun 10 15:50:14 2021 ::: Agent cannot be authenticated by server, response is: 0