Unable to add nodes NX protocol – Cannot authenticate

[esarmien]

Hi,

I am running a Cloud Server and attempting to add remote nodes using the NX protocol; I am running NoMachine-4.2.23-5.x86_64. I ran these commands–

First, I removed SSH connectivity, then added NX connectivity. As you can see, this failed.

/[root@rce6-portal-1 esarmien]# /usr/NX/bin/nxserver –list

NX> 127 Available sessions:

Display Username Remote IP Session ID Node

——- ——————————– ————— ——————————– ——————

[root@rce6-portal-1 esarmien]# /usr/NX/bin/nxserver –nodelist

NX> 104 Node list:

Status Connection Node Type LB Weight Limit Label

——- ———- ——————————- —- — —— —– —–

running encrypted rce6-1.priv.hmdc.harvard.edu:22 NX yes

running encrypted localhost:22 NX yes

running encrypted rce6-2.priv.hmdc.harvard.edu:22 NX yes

[root@rce6-portal-1 esarmien]# /usr/NX/bin/nxserver –nodedel localhost:22

NX> 125 Node: localhost:22 has been removed.

[root@rce6-portal-1 esarmien]# /usr/NX/bin/nxserver –nodedel rce6-1.priv.hmdc.harvard.edu:22

NX> 125 Node: rce6-1.priv.hmdc.harvard.edu:22 has been removed.

[root@rce6-portal-1 esarmien]# /usr/NX/bin/nxserver –nodedel rce6-2.priv.hmdc.harvard.edu:22

NX> 125 Node: rce6-2.priv.hmdc.harvard.edu:22 has been removed.

[root@rce6-portal-1 esarmien]# /usr/NX/bin/nxserver –nodeadd rce6-1.priv.hmdc.harvard.edu –protcol NX

NX> 596 ERROR: Cannot authenticate to the requested node.

NX> 999 Bye.

[root@rce6-portal-1 esarmien]# /usr/NX/bin/nxserver –nodeadd rce6-2.priv.hmdc.harvard.e

du –protcol NX

NX> 769 The authenticity of host ‘rce6-2.priv.hmdc.harvard.edu (10.0.0.94)’ can’t be established.

NX> 769 The certificate fingerprint is:

NX> 769 ‘9A:E6:19:14:23:37:0E:D5:D1:A1:D0:10:0F:C3:A9:3C:78:CB:EA:4A’

NX> 769 Are you sure you want to continue connecting? [yes|no]: yes

NX> 763 Could not authenticate on the remote node using servers public key.

NX> 763 Would you like to login on remote node as a privileged user to add

NX> 763 this key and try again? [yes|no]: yes

NX> 765 Username: esarmien

NX> 766 Password:

NX> 596 ERROR: Cannot authenticate to the requested node.

NX> 999 Bye.

I am including the configurations and logs (debugging on) for rce6-portal-1, rce6-1.priv and rce6-2.priv.

Because there is a 1MB limit on attachments, am adding here in Dropbox

https://www.dropbox.com/s/d8921xpkw1mqmkn/nx4-cant-add-nx-node.zip

Thanks,

Evan

[Haven]

Hello, we suspect that problem is related to authorization on the remote node with the public key

Can you please check if the issue persists also when you generate a new pair of keys?

Rename the original keys to preserve them:
/usr/NX/etc/keys/node.localhost.id_dsa
/usr/NX/etc/keys/node.localhost.id_dsa.pub
and generate a new key-pair by running on the server host:
# export LD_LIBRARY_PATH=/usr/NX/lib
# /usr/NX/bin/nxkeygen -k /usr/NX/etc/keys/node.localhost.id_dsa -p /usr/NX/etc/keys/node.localhost.id_dsa.pub -t dsa

Ensure that the new keys have proper permissions and ownership
and update the node:
# /usr/NX/bin/nxserver –nodeupdate <node>

Instructions are available also here:
https://www.nomachine.com/DT04L00069#4

• This reply was modified 10 years, 5 months ago by Haven.

[esarmien]

Works. Thanks!

[Haven]

hello,

if it is possible, can you send to us the previous pair of keys? We would like to investigate further in order to prevent a similar situation arising in the future.

[Author]

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