RUNCLUVFY: PRVF-7617 : Node connectivity

Before installing grid infrastructure, when i ran runcluvfy.sh i received following ERROR: PRVF-7617 : Node connectivity between "oracle-node-1 : 172.18.16.64" and "oracle-node-2 : 172.18.16.65" failed

[grid@oracle-node-1 grid]$ ./runcluvfy.sh comp nodecon -i eth0 -n oracle-node-1,oracle-node-2 -verbose

 ....................

 Check: TCP connectivity of subnet "172.18.16.0"

  Source                          Destination                     Connected?

  ------------------------------  ------------------------------  ----------------

  oracle-node-1:172.18.16.64      oracle-node-2:172.18.16.65      failed

ERROR:

PRVF-7617 : Node connectivity between "oracle-node-1 : 172.18.16.64" and "oracle-node-2 : 172.18.16.65" failed

Result: TCP connectivity check failed for subnet "172.18.16.0"

Checking subnet mask consistency...

Subnet mask consistency check passed for subnet "172.18.16.0".

Subnet mask consistency check passed for subnet "192.168.1.0".

Subnet mask consistency check passed.

Result: Node connectivity check failed

Verification of node connectivity was unsuccessful on all the specified nodes.

Solution: Stop any firewall running on nodes, in my case IPTABLES

[root@oracle-node-2 ~]# service iptables stop

iptables: Flushing firewall rules:                         [  OK  ]

iptables: Setting chains to policy ACCEPT: filter          [  OK  ]

iptables: Unloading modules:                               [  OK  ]

[grid@oracle-node-1 grid]$ ./runcluvfy.sh stage -pre crsinst -n oracle-node-1,oracle-node-2 -verbose

 ...........

Check: TCP connectivity of subnet "172.18.16.0"

  Source                          Destination                     Connected?

  ------------------------------  ------------------------------  ----------------

  oracle-node-1:172.18.16.64      oracle-node-2:172.18.16.65      passed

Result: TCP connectivity check passed for subnet "172.18.16.0"