Greetings @yagoaparecidoti
Thanks for using Cloudera Community. Based on the Post, you wish to confirm if the "maxClientCnxns" Parameter set via CDM (Assuming you mean CM) for ZooKeeper Service is referred in any file associated.
You may refer to the Value of "maxClientCnxns" in "zoo.cfg" file associated with the ZooKeeper Process. In CDP/CDH (Managed by CM), You may refer to the same within the ZooKeeper Process Directory under "/var/run/cloudera-scm-agent/process/<ZooKeeper-Process-Directory>/zoo.cfg". The concerned file would be referred in the "ps" Output of the ZooKeeper Process as well.
Regards, Smarak