INS-06006 GI RunInstaller Fails If OpenSSH Is Upgraded to 8.x

 When attempting to configure 19c grid infrastructure by running <gridSetup.sh>, the following error occurs in SSH connectivity step:

[INS-06006] Passwordless SSH connectivity not set up between the following node(s): [<racnode2>]

The error can't be ignored so CRS installation fails.

However, SSH setup shows successful and ssh <node> date command works fine for all nodes, CVU user equivalence check also shows passed status.

OpenSSH is upgraded to 8.x. Please note OpenSSH's behavior might be different on any other platforms/OS, for example on AIX, OpenSSH 7.5 has this problem, and on SLES Linux 12 SP4, OpenSSH_7.2p2 has this problem.

# ssh -V

OpenSSH_8.0p1, OpenSSL 1.0.2r 24 Aug 2020

The below command might also give the above error on OpenSSH 8.0.

# scp -p <racnode2>:"'/tmp/test.txt'" /tmp/test.txt

protocol error: filename does not match request

And the error can be avoided by adding "-T" option in the command:

# scp -T -p <racnode2>:"'/tmp/test.txt'" /tmp/test.txt

test.txt 100% 2 0.1KB/s 00:00

To mitigate the risk of (CVE-2019-6111), OpenSSH 8.0 adds client-side checking that the filenames sent from the server match the command-line request, if there is a difference between client and server wildcard expansion, the client may refuse files from the server. For this reason, OpenSSH 8.0 provids a new "-T" flag to scp that disables these client-side checks. for details, see https://www.openssh.com/txt/release-8.0

Workaround : 

Before installation, as root user: (please change the path if the location of your "scp" is not the same with below)

# Rename the original scp.

mv /usr/bin/scp /usr/bin/scp.orig

# Create a new file </usr/bin/scp>.

vi /usr/bin/scp

# Add the below line to the new created file </usr/bin/scp>.

/usr/bin/scp.orig -T $*

# Change the file permission.

chmod 555 /usr/bin/scp

After installation:

mv /usr/bin/scp.orig /usr/bin/scp