OHPC-SSH-HOSTKEY-CHANGE-FIX - Revision history

Admin at 20:28, 24 May 2022

2022-05-24T20:28:08Z

← Older revision		Revision as of 20:28, 24 May 2022
Line 12:		Line 12:
	SHA256:Tydfgvr4fQRlh2L/sqHu6gUR80O1DhDLBeL99HKaIQc.		SHA256:Tydfgvr4fQRlh2L/sqHu6gUR80O1DhDLBeL99HKaIQc.
	Please contact your system administrator.		Please contact your system administrator.
	Add correct host key in ~~~/ssivy~~/.ssh/known_hosts to get rid of this message.		Add correct host key in ~/.ssh/known_hosts to get rid of this message.
	Offending ECDSA key in ~/.ssh/known_hosts:154		Offending ECDSA key in ~/.ssh/known_hosts:154
	ECDSA host key for elsa.hpc.tcnj.edu has changed and you have requested strict checking.		ECDSA host key for elsa.hpc.tcnj.edu has changed and you have requested strict checking.

Admin at 20:24, 24 May 2022

2022-05-24T20:24:45Z

← Older revision		Revision as of 20:24, 24 May 2022
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	=== Mac ===		=== Mac ===
	Open a terminal window (you're probably already using the terminal window)		Open a terminal window (you're probably already using the terminal window).<br>
	Type the following before at the terminal prompts.		Type the following before at the terminal prompts.
	<pre>		<pre>

Admin at 20:24, 24 May 2022

2022-05-24T20:24:07Z

← Older revision		Revision as of 20:24, 24 May 2022
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	=== Windows ===		=== Windows ===
	You will most likely be prompted by your SSH/terminal program to confirm the change in the SSH host key fingerprint. ~~Select~~ Ok/Confirm/etc. button to accept the new key.		You will most likely be prompted by your SSH/terminal program to confirm the change in the SSH host key fingerprint. Click the Ok/Confirm/etc. button to accept the new key.

	=== Mac ===		=== Mac ===

Admin at 20:23, 24 May 2022

2022-05-24T20:23:36Z

← Older revision		Revision as of 20:23, 24 May 2022
Line 1:		Line 1:

	You may get the error below when trying to SSH in from your ~~Apple~~ Mac ~~computer~~, ~~Windows PC, Linux~~ PC or using the ~~"ELSA~~ OpenHPC Shell Access" in Open OnDemand.		You may get the error below when trying to SSH to the new ELSA cluster from your Mac, PC or when using the <code>>_ELSA OpenHPC Cluster Shell Access</code> terminal in Open OnDemand.

	<pre>		<pre>

Admin at 20:22, 24 May 2022

2022-05-24T20:22:13Z

← Older revision		Revision as of 20:22, 24 May 2022
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	~~ssh-keygen -R elsa.hpc.tcnj.edu~~
	~~ssh-keygen -R 159.91.50.30~~

	~~key fingerprint~~

	You may get the error below when trying to SSH in from your Apple Mac computer, Windows PC, Linux PC or using the "ELSA OpenHPC Shell Access" in Open OnDemand.		You may get the error below when trying to SSH in from your Apple Mac computer, Windows PC, Linux PC or using the "ELSA OpenHPC Shell Access" in Open OnDemand.
Line 16:		Line 12:
	SHA256:Tydfgvr4fQRlh2L/sqHu6gUR80O1DhDLBeL99HKaIQc.		SHA256:Tydfgvr4fQRlh2L/sqHu6gUR80O1DhDLBeL99HKaIQc.
	Please contact your system administrator.		Please contact your system administrator.
	Add correct host key in ~~/Users~~/ssivy/.ssh/known_hosts to get rid of this message.		Add correct host key in ~/ssivy/.ssh/known_hosts to get rid of this message.
	Offending ECDSA key in ~~/Users/ssivy~~/.ssh/known_hosts:154		Offending ECDSA key in ~/.ssh/known_hosts:154
	ECDSA host key for elsa.hpc.tcnj.edu has changed and you have requested strict checking.		ECDSA host key for elsa.hpc.tcnj.edu has changed and you have requested strict checking.
	Host key verification failed.		Host key verification failed.
Line 28:		Line 24:

	=== Mac ===		=== Mac ===
	~~From the Finder menu~~		Open a terminal window (you're probably already using the terminal window)
	~~Choose Go > Go to folder...~~		Type the following before at the terminal prompts.
	~~In the dialog box enter ~/.ssh and click Go~~		<pre>
			ssh-keygen -R elsa.hpc.tcnj.edu
	~~Method 1: the hammer~~		ssh-keygen -R 159.91.50.30
	~~Drag the known_hosts file to your recycle bin~~		</pre>
	~~Close the folder and retry your SSH~~ (~~it may prompt~~ you ~~to trust~~ the ~~new key, type Yes~~)		Retry your SSH command again.<br>
			You will probably be asked to accept/confirm the SSH host key fingerprint. Type <code>yes</code> and press the ENTER or RETURN key. This should only happen the first time after running the <code>ssh-keygen</code> commands.
	~~Method 2:~~ the ~~scapel~~
	~~Right-click on the known_hosts file and choose Open With~~ > ~~TextEdit~~
	~~Find the line that starts with~~ elsa.hpc.tcnj.edu ~~and delete the entire line~~
	~~Save the file~~
	~~Exit TextEdit~~
	~~Close the folder and retry~~ your SSH ~~(it may prompt you~~ to ~~trust~~ the ~~new~~ key~~, type Yes)~~


	=== Open OnDemand Web Portal ===		=== Open OnDemand Web Portal ===
	While ~~the~~ error ~~does not~~ prevent you from opening a terminal, you ~~may want to follow these instructions to remove~~ the error message.		While this error doesn't prevent you from opening an <code>>_ELSA OpenHPC Cluster Shell Access</code> terminal window, you will get the error message each time. To get rid of that message, follow these steps.
	~~Login to Open OnDemand (http://ondemand.hpc.tcnj.edu/)~~
	~~Go to Files > Home Directory~~
	~~Click on the Change Directory button~~
	~~Add /.ssh to what is there (e.g~~. ~~/home/hpc/ssivy/.ssh) and click the OK button~~

			Type the following at the Linux command prompt.
			<pre>
			ssh-keygen -R elsa.hpc.tcnj.edu
			ssh-keygen -R 159.91.50.30
			</pre>

	~~Method 1:~~ the ~~hammer~~		Type <code>exit</code> and close the browser tab with the terminal.
	~~Click~~ the ~~vertically stacked 3 dot pull down next to the known_hosts file~~		Open a new <code>>_ELSA OpenHPC Cluster Shell Access</code> terminal.<br>
	~~Choose Delete and click OK to confirm~~		You may see a message about adding a new host key. This should only happen the first time after running the <code>ssh-keygen</code> commands.
	~~Retry Clusters~~ > ~~ELSA~~ OpenHPC Cluster Shell Access

	~~Method 2: the scapel~~
	~~Click the vertically stacked 3 dot pull down next to the known_hosts file~~
	~~Choose Edit~~
	~~Find the line that starts with elsa.hpc.tcnj~~.~~edu and delete~~ the ~~entire line~~
	~~Click~~ the ~~Save button near the top of the window~~
	~~Close the browser tab with the edit window~~
	~~Retry Clusters~~ > ~~ELSA OpenHPC Cluster Shell Access~~

Admin: Created page with "ssh-keygen -R elsa.hpc.tcnj.edu ssh-keygen -R 159.91.50.30 key fingerprint You may get the error below when trying to SSH in from your Apple Mac computer, Windows PC, Linux..."

2022-05-24T17:00:29Z

Created page with "ssh-keygen -R elsa.hpc.tcnj.edu ssh-keygen -R 159.91.50.30 key fingerprint You may get the error below when trying to SSH in from your Apple Mac computer, Windows PC, Linux..."

New page

ssh-keygen -R elsa.hpc.tcnj.edu
ssh-keygen -R 159.91.50.30

key fingerprint

You may get the error below when trying to SSH in from your Apple Mac computer, Windows PC, Linux PC or using the "ELSA OpenHPC Shell Access" in Open OnDemand.

<pre>
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that a host key has just been changed.
The fingerprint for the ECDSA key sent by the remote host is
SHA256:Tydfgvr4fQRlh2L/sqHu6gUR80O1DhDLBeL99HKaIQc.
Please contact your system administrator.
Add correct host key in /Users/ssivy/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /Users/ssivy/.ssh/known_hosts:154
ECDSA host key for elsa.hpc.tcnj.edu has changed and you have requested strict checking.
Host key verification failed.
</pre>

To resolve the issue and remove the error message, follow the instruction below based on the platform from where you are running the SSH command.

=== Windows ===
You will most likely be prompted by your SSH/terminal program to confirm the change in the SSH host key fingerprint. Select Ok/Confirm/etc. button to accept the new key.

=== Mac ===
From the Finder menu
Choose Go > Go to folder...
In the dialog box enter ~/.ssh and click Go

Method 1: the hammer
Drag the known_hosts file to your recycle bin
Close the folder and retry your SSH (it may prompt you to trust the new key, type Yes)

Method 2: the scapel
Right-click on the known_hosts file and choose Open With > TextEdit
Find the line that starts with elsa.hpc.tcnj.edu and delete the entire line
Save the file
Exit TextEdit
Close the folder and retry your SSH (it may prompt you to trust the new key, type Yes)

=== Open OnDemand Web Portal ===
While the error does not prevent you from opening a terminal, you may want to follow these instructions to remove the error message.
Login to Open OnDemand (http://ondemand.hpc.tcnj.edu/)
Go to Files > Home Directory
Click on the Change Directory button
Add /.ssh to what is there (e.g. /home/hpc/ssivy/.ssh) and click the OK button

Method 1: the hammer
Click the vertically stacked 3 dot pull down next to the known_hosts file
Choose Delete and click OK to confirm
Retry Clusters > ELSA OpenHPC Cluster Shell Access

Method 2: the scapel
Click the vertically stacked 3 dot pull down next to the known_hosts file
Choose Edit
Find the line that starts with elsa.hpc.tcnj.edu and delete the entire line
Click the Save button near the top of the window
Close the browser tab with the edit window
Retry Clusters > ELSA OpenHPC Cluster Shell Access