After patching to RHEL 7.3 firewalld restart generates unsupported format character error. The errors should not be there (no error in RHEL 7.2)
Error output:
Nov 11 16:32:03 brppemail01 firewalld: ERROR: Calling post func <function ifcfg_set_zone_of_interface at 0x25067d0>(('internal', 'ens192')) failed: unsupported format character ':' (0x3a) at index 1
Nov 11 16:32:03 brppemail01 firewalld: ERROR: Calling post func <function ifcfg_set_zone_of_interface at 0x25067d0>(('public', 'ens224')) failed: unsupported format character ':' (0x3a) at index 1

[root@dhcp2-62 ]# cat etc/redhat-release 
Red Hat Enterprise Linux Server release 7.3 (Maipo)
[root@dhcp2-62 ]# 
[root@dhcp2-62 ]# cat installed-rpms | grep firewalld
firewalld-0.4.3.2-8.el7.noarch                              Fri Nov 11 15:25:34 2016
firewalld-filesystem-0.4.3.2-8.el7.noarch                   Fri Nov 11 15:24:27 2016
[root@dhcp2-62 ]# 

[root@dhcp2-62 ]# cat uname 
Linux brppemail01 3.10.0-327.13.1.el7.x86_64 #1 SMP Mon Feb 29 13:22:02 EST 2016 x86_64 x86_64 x86_64 GNU/Linux
[root@dhcp2-62 ]# 

[root@dhcp2-62 ]# cat etc/sysconfig/network-scripts/ifcfg-ens192 
TYPE=Ethernet
BOOTPROTO=static
IPV4_FAILURE_FATAL=yes
NAME=ens192
UUID=c9accfb0-f422-463a-9857-5a24f08ee486
DEVICE=ens192
ONBOOT=yes
#DNS1="192.168.18.155"
IPADDR=192.168.161.22
PREFIX="24"
ZONE=internal

check_link_down() {
 return 1;
}
[root@dhcp2-62 ]# cat etc/sysconfig/network-scripts/ifcfg-ens224 
TYPE="Ethernet"
BOOTPROTO="static"
DEFROUTE="yes"
IPV4_FAILURE_FATAL="yes"
IPV6INIT="yes"
#IPV6_AUTOCONF="yes"
#IPV6_DEFROUTE="yes"
#IPV6_FAILURE_FATAL="no"
NAME="ens224"
UUID="c9accfb0-f422-463a-9857-5a24f08ee486"
DEVICE="ens224"
ONBOOT="yes"
#DNS1="192.168.18.155"
IPADDR="10.118.38.136"
PREFIX="24"
GATEWAY="10.118.38.129"
IPV6ADDR="2607:f798:f:e0d::7/64"
IPV6_DEFAULTGW="2607:f798:f:e0d::1"
#IPV6_PEERDNS="yes"
#IPV6_PEERROUTES="yes"
#IPV6_PRIVACY="no"
[root@dhcp2-62 ]#