Resolution

If cloned system is registered using RHN classic, then following steps should apply:

• Remove existing systemid file by running following command:

# rm -fr /etc/sysconfig/rhn/systemid

• Register system by running following command:

# rhn_register

or 

# rhnreg_ks --username=<RHN username> --password=<RHN password>

If Cloned system registered using Subscription Management method, then following steps should apply:

• Change hostname and other network information on cloned VM.
• Run following commands in order to remove all of the subscription and identity data from the local system:

# subscription-manager clean 

• Register system by running following command:

# subscription-manager register --username=<RHN username> --password=<RHN password> --autosubscribe