Inter-Satellite sync gives ERROR: The Server listed within iss-parent is not configured for ISS capability"

Issue

• Customer trying to sync 2 satellite using satellite-sync command.Once satellite server located inside a private network ( master satellite) and the other satellite server ( slave satellite server) locate in the outside world.

• Slave satellite server has to go through a Firewall to contact master satellite server.

• Firewall performs NAT'ting. (Network Address Translation)

• Firewall traslate slave satellite server public IP address to private ip address.

For Example :

Master satellite server :

• hostname : rhn.master-satellite.com
• ip address : 82.x.36.189

slave satellite server :

• public hostname : host1.public-hostname.com
• public ip : 14.x.194.236

Firewall translate this public ip/hostname to following :

• private hostename : host1.private-hostname.com
• private ip : 10.x.59.15

Customer has the following lines on master satellite server :

/etc/rhn/rhn.conf

disable_iss=0
allowed_iss_slaves=host1.public-hostname.com

Now trying to do the satellite sync and gets the following error :

ERROR: The Server listed within iss-parent is not configured for ISS
       capability.
       Please review your configuration before trying again.