problems connecting hosts to sat 6.5

I have a rhel7 server with satellite 6.5.
Some of the clients are having a problem connecting to the satellite, while on the same subnet. Some have connected fine, others cannot. It's like there is a firewall in the way, but the firewall on the clients is temp stopped, same with the satellite. I am assured there is no hardware firewall in the way.
These clients can't ping, trareroute, ssh, nothing to this satellite server.
They are able to ssh to each other, and they connected fine to my old satellite 5.8 server. I just can't get them to the new satellite. Also, the new satellite cannot get to the clients in any way. So, the problem exists in both directions. I can ssh to all the servers from my own console, so sshd is active on them.

Anything I can look at? Selinux is permissive right now, as well.

I guess the satellite aspect of this doesn't matter. Only the server settings.
the host is rhel7 and the clients are all rhel 6, at this time.