Port 8083 already in use

Document ID : KB000095488
Last Modified Date : 11/05/2018
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After installing the PAM, PAM service could not start and c2o.log has below error::
"ERROR [org.jboss.kernel.plugins.dependency.AbstractKernelController] [ main] Error installing to Start: name=jboss:service=WebService state=Create mode=Manual requiredState=Installed 
java.lang.Exception: Port 8083 already in use"
PAM version: 4.3.2
OS: RHEL 7.4
System hosts file(/etc/hosts) contains invalid IP Address
1.Open the system hosts file
    Check whether it has the valid IP Address of the system or not and correct it if needed and save.
2. Restart the PAM service.