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Tested resource agent from upstream and verified that it's working on RHEL7.

The easiest example would be to simply block one of the ports for a service:
# pcs resource create VIP IPaddr2 ip=192.168.122.122
# pcs resource create pb ocf:heartbeat:portblock protocol=tcp portno=3306 action=block ip=192.168.122.122
# pcs resource create NFS nfsserver
# pcs resource group add NFS-group VIP pb NFS
# iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination         
DROP       tcp  --  anywhere             HOSTNAME              multiport dports mysql

I'm using a MySQL port in this example to avoid NFS failing.

Tested and working patch: https://github.com/ClusterLabs/resource-agents/pull/845

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2016-2174.html