11GR2 RAC INS-06006 passwordless SSH connectivity not set up between the following node (s) solution

First. Description of the problem
The 11GR2 11.2.0.3 RAC is installed on the AIX operating system, and a INS-06006 error is encountered while installing grid. 

Second, the processing process
1, testing the interoperability of SSH

In the Node1 node

Date;ssh Node2 date;
Date;ssh Node2-priv date;
Date;ssh Node1 date;
Date;ssh Node1-priv date;

In the Node2 node

Date;ssh Node1 date;
Date;ssh Node1-priv date;
Date;ssh Node2 date;
Date;ssh Node2-priv date;

There is no problem with the interoperability between nodes.

2, according to the top note:solutions for typical Grid infrastructure/rac Database runinstaller Issues (document ID 1056713.1) document processing

P: [INS-06006] Passwordless SSH connectivity not set up between the following node(s): [node1, node2]. CVU may reports "PRVF-4007 : User equivalence check failed for user "user"" for same error

S: Possible causes:
Grid user does not have password on OS level, the fix is to set password with "passwd" command.
If OUI is able to setup passwordless SSH connectivity but still shows the error, likely "ping" command is inaccessible - grid user should be able to execute ping command.
OS command ssh or scp are not in expected location, the workaround is to either create symbolic link on all nodes or export the following environment variables before starting OUI

ln -s /usr/local/bin/ssh /usr/bin/ssh
ln -s /usr/local/bin/scp /usr/bin/scp

OR

export ORACLE_SRVM_REMOTESHELL=/usr/local/bin/ssh
export ORACLE_SRVM_REMOTECOPY=/usr/local/bin/scp

Note: /usr/local/bin is the location for ssh and scp, if ssh and scp are located in somewhere else, replace it accordingly
For other causes and solutions, refer to note 1323714.1

According to the above processing complete problem still exists.

3, re-run the grid user profile again, the problem is not resolved

. . Profile

4, check the/etc/hosts file, found that the host name matching IP is all uppercase.

This is with 11.2.0.4 Runinstaller: [INS-06006] passwordless SSH connectivity not set up between the following nodes (s) (document ID 159721 2.1 The document describes the same problem.

After the host name is all lowercase, the problem is resolved.

Installing 11.2.0.4 Grid Infrastructure patch set, runInstaller reports error: [INS-06006] Passwordless SSH connectivity not set up between the following nodes (s): [racnode1].

In installActions<timestamp>.log
INFO: Preparing to check passwordless SSH Connectivity between nodes: [RACNODE1, RACNODE2] ====>> "hostname" command returns upper case hostname
INFO: Testing passwordless SSH connectivity between the selected nodes. This may take several minutes, please wait...
INFO: OverallStatus of User Equivalence check using CVU is SUCCESSFUL
FINEST: oracle.install.driver.oui.OUISSHSupportManager: Checking whether RACNODE1 is a local node or not.
FINEST: oracle.install.driver.oui.OUISSHSupportManager:Identified RACNODE1 as the local node.
INFO: Finding passwordless SSH connectivity setup on remote nodes
INFO: Preparing remote commands to check passwordless SSH connectivity setup on remote nodes
INFO: Total number of remote commands to be executed is 4
WARNING: Failed while executing remote commands to check SSH connectivity to other nodes..
Refer associated stacktrace #oracle.install.driver.oui.OUISSHSupportManager:964
INFO: Source Node: racnode1 Target Node: racnode1
INFO: Exception: null
INFO: Status log: oracle.install.driver.oui.OUISSHSupportManager$SSHSetupVerificationCommand: 0|ssh: Could not resolve hostname -o FallBackToRsh=no : Temporary failure in name resolution :failed
....
INFO: Remote node(s) not configured for passwordless SSH connectivity : [racnode1]
INFO: Details about the list of remote node(s), not configured for passwordless SSH connectivity
---------------------------------
NODE REMOTE NODES
---------------------------------
Racnode1 [racnode1, racnode2] ====>> converted to lower case in the code
---------------------------------

In the oraInstall<timestamp>.err file
---# Begin Stacktrace #---------------------------
ID: oracle.install.driver.oui.OUISSHSupportManager: 569
oracle.ops.mgmt.cluster.ClusterException: ssh: -o FallBackToRsh = no: Name or service not known: failedssh: -o FallBackToRsh = no: Name or service not known: failed: successful: successful
At oracle.ops.mgmt.cluster.ClusterConfig.submit(ClusterConfig.java:578)
At oracle.ops.mgmt.cluster.ClusterCmd.submit(ClusterCmd.java:269)
At oracle.ops.mgmt.cluster.ClusterCmd.submit(ClusterCmd.java:294)
At oracle.install.driver.oui.OUISSHSupportManager.getUnconfiguredRemoteNodes(OUISSHSupportManager.java:428)
At oracle.install.driver.oui.OUISSHSupportManager.getSSHConnectivityDetails(OUISSHSupportManager.java:378)
At oracle.install.commons.net.support.SSHSupportManager.getSSHConnectivityDetails(SSHSupportManager.java:181)
At oracle.install.ivw.common.view.SSHSetupPane$8.perform(SSHSetupPane.java:305)
At oracle.install.ivw.common.view.SSHSetupPane$SSHOperation.run(SSHSetupPane.java:336)
---# End Stacktrace #-----------------------------

Hostname is in mixed case (in this example upper case)

$ grep RACNODE /etc/hosts
10.0.0.101 RACNODE1.US.ORACLE.COM RACNODE1
10.0.0.102 RACNODE2.US.ORACLE.COM RACNODE2

Reason Analysis:
Upper or mixed case hostname being used, this are being investigated in bug 17580744
Duplicates:
BUG 17666448-ins-06006 occurs IF HOSTNAME is in letters for GI installation
BUG 17675476-passwordless SSH Connectivity not SET up BETWEEN the following NODES


Reference:
11.2.0.4 Runinstaller: [INS-06006] passwordless SSH connectivity not set up between the following nodes (s) (document ID 1597212. 1)
Top note:solutions for typical Grid infrastructure/rac Database runinstaller Issues (document ID 1056713.1)

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