INFO: /tmp/OraInstall2020-05-04_11-56-08PM/mvstubs.sh
INFO: Copying Oracle home ‘/u01/app/11.2.0/grid‘ to remote nodes ‘wsgw2‘.
INFO: Copying Oracle home ‘/u01/app/11.2.0/grid‘ to remote nodes ‘wsgw2‘.
WARNING: Error while copying directory /u01/app/11.2.0/grid with exclude file list ‘/tmp/OraInstall2020-05-04_11-56-08PM/installExcludeFile.lst‘

 to nodes ‘wsgw2‘. [PRCF-2010 : All connections to the remote nodes got refused. Cannot proceed with the file transfer. 
There has to be at least one remote node to send the installer files!
PRCF-2010 : All connections to the remote nodes got refused. Cannot proceed with the file transfer. There has to be at least one
 remote node to send the installer files!]
Refer to ‘/u01/app/oraInventory/logs/installActions2020-05-04_11-56-08PM.log‘ for details. You may fix the errors on the
 required remote nodes. Refer to the install guide for error recovery. Click ‘Yes‘ if you want to proceed. Click ‘No‘
 to exit the install. Do you want to continue?

Linux: GI installation fails as bindv6only is set to 1: "PRCF-2010 : 
All connections to the remote nodes got refused. Cannot proceed with the file transfer" (Doc ID 1999296.1)    
The firewall is disabled and hence not the cause of the connections being refused
虽然版本不太匹配，MOS是12.1 但是其中有关于ip6tables!!!
root@node1:~$ /etc/init.d/iptables status
iptables: Firewall is not running.
root@node1:~$ /etc/init.d/ip6tables status
ip6tables: Firewall is not running.
root@node2:~$ /etc/init.d/iptables status
iptables: Firewall is not running.
root@node2:~$ /etc/init.d/ip6tables status
ip6tables: Firewall is not running.
 
SOLUTION
The issue is caused by the kernel parameter net.ipv6.bindv6only being set to 1 as seen below

grid@node1:~> sysctl net.ipv6.bindv6only
net.ipv6.bindv6only = 1
grid@node1:~>
The solution is to set net.ipv6.bindv6only to 0 and install the Grid Infrastructure software

node1:~ # sysctl net.ipv6.bindv6only=0
net.ipv6.bindv6only = 0
node1:~ #

系统安装redhat6.9 防火墙已关闭，但是对于ipv6的服务并未关闭！！！ 因此是这个问题导致的，关闭ipv6服务后，ok  两个节点都要操作
[root@wsgw1 CVU_11.2.0.4.0_grid]# /etc/init.d/iptables status
iptables: Firewall is not running.
[root@wsgw1 CVU_11.2.0.4.0_grid]# sysctl net.ipv6.bindv6only 
net.ipv6.bindv6only = 0
[root@wsgw1 CVU_11.2.0.4.0_grid]# 
[root@wsgw1 CVU_11.2.0.4.0_grid]# 
[root@wsgw1 CVU_11.2.0.4.0_grid]#  sysctl -a|grep -i ‘ipv6‘|grep ‘disable‘
net.ipv6.conf.all.disable_ipv6 = 0
net.ipv6.conf.default.disable_ipv6 = 0
net.ipv6.conf.eth0.disable_ipv6 = 0
net.ipv6.conf.eth1.disable_ipv6 = 0
net.ipv6.conf.lo.disable_ipv6 = 0
[root@wsgw1 CVU_11.2.0.4.0_grid]# /etc/init.d/ip6tables status
Table: filter
Chain INPUT (policy ACCEPT)
num  target     prot opt source               destination         
1    ACCEPT     all      ::/0                 ::/0                state RELATED,ESTABLISHED 
2    ACCEPT     icmpv6    ::/0                 ::/0                
3    ACCEPT     all      ::/0                 ::/0                
4    ACCEPT     udp      ::/0                 fe80::/64           state NEW udp dpt:546 
5    ACCEPT     tcp      ::/0                 ::/0                state NEW tcp dpt:22 
6    REJECT     all      ::/0                 ::/0                reject-with icmp6-adm-prohibited 

Chain FORWARD (policy ACCEPT)
num  target     prot opt source               destination         
1    REJECT     all      ::/0                 ::/0                reject-with icmp6-adm-prohibited 

Chain OUTPUT (policy ACCEPT)
num  target     prot opt source               destination         

[root@wsgw1 CVU_11.2.0.4.0_grid]# /etc/init.d/ip6tables stop
ip6tables: Setting chains to policy ACCEPT: filter         [  OK  ]
ip6tables: Flushing firewall rules:                        [  OK  ]
ip6tables: Unloading modules:                              [  OK  ]
[root@wsgw1 CVU_11.2.0.4.0_grid]# chkconfig --level 35 iptables off 

[root@wsgw2 CVU_11.2.0.4.0_grid]#  /etc/init.d/ip6tables status
ip6tables: Firewall is not running.