The Oracle HTTP Server instance is down- WEBSERVER (OHS) 12.1.0.1.0 service is up on host but target shows down in EM12c (Agent & OMS version 12.1.0.4.0)

The Oracle HTTP Server instance is down- WEBSERVER (OHS) 12.1.0.1.0 service is up on host but target shows down in EM12c (Agent & OMS version 12.1.0.4.0)

OHS Target shows down in EM12c console whereas the service is up on the 
node.

Agent Version          : 12.1.0.4.0
OMS Version (EM12c)    : 12.1.0.4.0


Target Details
-------------------
Target type=Oracle HTTP Server
Target name=/SID_host_port_base_domain/sid_host/ohs1
Categories=Availability
Message=The Oracle HTTP Server instance is down

Host = localhost.domain.com
Admin url = http://localhost:port/console

OHS Target shows down in EM12c console whereas the service is up on the 
node as shown below.


cd /sid/admin/sid_host/bin

$ ./opmnctl status -l

Processes in Instance: sid_hostname

ias-component  status
-------------  ------
ohs1           alive   


cd /sid/fmw/product/111/ohs_111/opmn/bin


ias-component  status
-------------  ------
ohs1           alive 


$./opmnctl status

Processes in Instance: sid_host
                

This may be a bug & possible issue may be with the JMX connections as observed from error messages like below in the logs

Caused by: java.io.IOException: Failed attempting connection on serviceURL 

service:jmx:t3://host.domain.com:port/jndi/weblogic.management.mbeanservers.domainruntime