Not able to Replicate Groups from Author to Publish servers

Hi All,

    I am facing a replicating issue in all DEV,QA and PROD servers for only groups(even tried with Administrator credentials). When i replicate any of the groups, Replication Queue is getting blocked.

    Below is the error am seeing in the log.

18.09.2015 09:54:24 - ERROR - publish0 : << HTTP/1.1 400 Bad Request
 18.09.2015 09:54:24 - ERROR - publish0 : << Connection: Close
 18.09.2015 09:54:24 - ERROR - publish0 : << Server: Day-Servlet-Engine/4.1.32
 18.09.2015 09:54:24 - ERROR - publish0 : << Content-Type: text/plain;charset=utf-8
 18.09.2015 09:54:24 - ERROR - publish0 : << Content-Length: 136
 18.09.2015 09:54:24 - ERROR - publish0 : << Date: Fri, 18 Sep 2015 16:54:24 GMT
 18.09.2015 09:54:24 - ERROR - publish0 : <<
 18.09.2015 09:54:24 - ERROR - publish0 : << error: com.day.cq.replication.ReplicationException: Repository error during page import: Unable to perform operation. Node is protected.
 18.09.2015 09:54:24 - ERROR - publish0 : Message sent.
 18.09.2015 09:54:24 - ERROR - publish0 : ------------------------------------------------
 18.09.2015 09:54:24 - INFO - publish0 : Replication (ACTIVATE) of /home/groups/c/communication_users not successful.

I have checked for node permissions, everything looks fine to me.

Can anyone able to help me with this issue?

Thanks,

Deepan.