Network for Advanced NMR - User contributions [en]

Why can't I create a New Request for UHF access?

2025-08-20T12:06:40Z

Gweatherby: typo in cat

{{FAQReturn}}

=== Why You May Not Be Able to Create a UHF Request ===

If you're unable to create a UHF request, consider the following possible reasons:

# '''You are not logged into the NAN web portal.'''
## Check the upper right-hand corner of the site in the NMRhub widget.
## The person icon should be green. If it is grey, you are not logged in.
## Log in before attempting to create a UHF request.

# '''You do not have permission to create a UHF request.'''
## Only PIs or users who have been granted '''UHF Submitter''' privileges can submit requests.
## A PI can assign this role via:
### '''Lab Administration → Permissions → Lab View'''

Please see [[UHF Access]] for requirements and instructions on creating UHF requests
[[Category:FAQ]] [[Category:UHF Access]]

SSH troubleshooting

2025-02-04T22:19:28Z

Gweatherby: Expand WinSCP section

== SSH Troubleshooting ==

[https://nmrhub.org NMRhub] now requires an SSH key pair to connect. Use [https://openssh.com SSH / SFTP / rsync] and tools like [https://filezilla-project.org FileZilla] to connect to NMRhub virtual machines (VMs).

=== Where is my private key? ===

After following the instructions at [https://nmrbox.nmrhub.org/user-dashboard/ssh-key NMRbox User Dashboard SSH Key Setup], your private key should be at:
* On Mac/Linux: <code>$HOME/.ssh/id_ed25519</code>
* On Windows: <code>%HOMEDRIVE%%HOMEPATH%\.ssh\id_ed25519</code>

=== I have the private key in place, but I can't connect. ===

# Try connecting to more than one VM to make sure it's not just an issue with that specific VM. (Please let us know if you can SSH to one VM but not another via [mailto:support@nmrbox.org support@nmrbox.org].)
# Use <code>ssh -vvv</code> to verify if SSH is attempting to use your private key.

==== It's trying to use the key, but it still doesn't work. ====

If you can't connect after uploading your SSH key, verify the following commands give the same result. Windows users should run these commands from PowerShell:

<syntaxhighlight lang="bash">
ssh-keygen -lf $HOME/.ssh/id_ed25519
ssh-keygen -lf $HOME/.ssh/id_ed25519.pub
</syntaxhighlight>

Ensure the key listed at [https://nmrbox.nmrhub.org/user-dashboard/ssh-key NMRbox User Dashboard SSH Key] matches your <code>$HOME/.ssh/id_ed25519.pub</code>.

[[File:sample.jpeg|thumb|Date key set]]

=== Home Directory Permissions ===

If your home directory is writable by anyone other than you, SSH will not work. Connect via [https://nmrbox.nmrhub.org/pages/getting-started VNC] and run:

<syntaxhighlight lang="bash">
ls -l ~
</syntaxhighlight>

If '''<code>w</code>''' appears after the first group of permissions (e.g., <code>drwx</code>), use the following command to correct it:

<syntaxhighlight lang="bash">
chmod go-w ~
</syntaxhighlight>

=== How do I use a private key with <code>rsync</code>? ===

Add the following option to your <code>rsync</code> command:

<syntaxhighlight lang="bash">
-e "ssh -i /path/to/your/private_key"
</syntaxhighlight>

=== How do I use a private key with <code>sftp</code>? ===

Add the following option to your <code>sftp</code> command:

<syntaxhighlight lang="bash">
-i /path/to/your/private_key
</syntaxhighlight>

=== How do I use a private key with FileZilla? ===

Go to FileZilla's '''Site Manager''' and make the following settings in the '''General''' tab. You can leave the port blank, as it defaults to the correct value (22).

* '''Protocol:''' SFTP - SSH File Transfer Protocol
* '''Host:''' ''element''.nmrbox.org
* '''Port:''' Leave blank
* '''Logon Type:''' Key file
* '''User:''' ''username''
* '''Key file:''' ''local path''/.ssh/id_ed25519

=== How do I use a private key with [https://winscp.net WinSCP]? ===

Note that NMRhub allows multiple keys to be uploaded to the dashboard. On Windows, [https://winscp.net/eng/docs/ui_puttygen PuTTYgen] can be used to generate an additional key. The PuTTYgen window provides the public key to add to the [https://nmrbox.nmrhub.org/user-dashboard/ssh-key NMRhub dashboard].

=== How do I <code>scp</code> from a shared account? ===

(Note: This is not an endorsement of shared accounts, but that is a site-specific decision.)

If multiple users are using a shared account (e.g., from a spectrometer console), the following steps will allow copying local data to each user's account. For this example, we assume your username is <code>rernst</code>.

# '''Create another SSH key pair with a passphrase:'''

<syntaxhighlight lang="bash">
ssh-keygen -t ed25519 -C "spectrometer scp"
Generating public/private ed25519 key pair.
Enter file in which to save the key (/Users/rernst/.ssh/id_ed25519): id_ed25519rernst
Enter passphrase (empty for no passphrase): <type a password>
Enter same passphrase again: <retype the password>
Your identification has been saved in id_ed25519rernst
Your public key has been saved in id_ed25519rernst.pub
</syntaxhighlight>

# '''Add''' the contents of <code>id_ed25519rernst.pub</code> to [https://nmrbox.nmrhub.org/user-dashboard/ssh-key NMRbox User Dashboard SSH Key].

# Go to the home directory of the shared account. Create an <code>.ssh</code> directory if necessary and ensure it has permissions <code>drwx------</code>:

<syntaxhighlight lang="bash">
cd $HOME
mkdir -p .ssh
chmod 700 .ssh
</syntaxhighlight>

# Create or edit <code>~/.ssh/config</code> and add the following lines:

<syntaxhighlight lang="bash">
Match User rernst Host *.nmrbox.org
IdentityFile ~/.ssh/id_ed25519rernst
</syntaxhighlight>

# You should now be able to copy data from the shared account to <code>nmrbox.org</code>:

<syntaxhighlight lang="bash">
scp fid rernst@*element*.nmrbox.org:
</syntaxhighlight>

When prompted:

<syntaxhighlight lang="text">
Enter passphrase for key 'home_directory/.ssh/id_ed25519rernst':
</syntaxhighlight>

Enter the password you used when creating the key pair.

SSH troubleshooting

2025-02-04T21:50:11Z

Gweatherby: Create from https://github.com/NMRhub/NMRhub_SSH_Troubleshooting/

== SSH Troubleshooting ==

[https://nmrhub.org NMRhub] now requires an SSH key pair to connect. Use [https://openssh.com SSH / SFTP / rsync] and tools like [https://filezilla-project.org FileZilla] to connect to NMRhub virtual machines (VMs).

=== Where is my private key? ===

After following the instructions at [https://nmrbox.nmrhub.org/user-dashboard/ssh-key NMRbox User Dashboard SSH Key Setup], your private key should be at:
* On Mac/Linux: <code>$HOME/.ssh/id_ed25519</code>
* On Windows: <code>%HOMEDRIVE%%HOMEPATH%\.ssh\id_ed25519</code>

=== I have the private key in place, but I can't connect. ===

# Try connecting to more than one VM to make sure it's not just an issue with that specific VM. (Please let us know if you can SSH to one VM but not another via [mailto:support@nmrbox.org support@nmrbox.org].)
# Use <code>ssh -vvv</code> to verify if SSH is attempting to use your private key.

==== It's trying to use the key, but it still doesn't work. ====

If you can't connect after uploading your SSH key, verify the following commands give the same result. Windows users should run these commands from PowerShell:

<syntaxhighlight lang="bash">
ssh-keygen -lf $HOME/.ssh/id_ed25519
ssh-keygen -lf $HOME/.ssh/id_ed25519.pub
</syntaxhighlight>

Ensure the key listed at [https://nmrbox.nmrhub.org/user-dashboard/ssh-key NMRbox User Dashboard SSH Key] matches your <code>$HOME/.ssh/id_ed25519.pub</code>.

[[File:sample.jpeg|thumb|Date key set]]

=== Home Directory Permissions ===

If your home directory is writable by anyone other than you, SSH will not work. Connect via [https://nmrbox.nmrhub.org/pages/getting-started VNC] and run:

<syntaxhighlight lang="bash">
ls -l ~
</syntaxhighlight>

If '''<code>w</code>''' appears after the first group of permissions (e.g., <code>drwx</code>), use the following command to correct it:

<syntaxhighlight lang="bash">
chmod go-w ~
</syntaxhighlight>

=== How do I use a private key with <code>rsync</code>? ===

Add the following option to your <code>rsync</code> command:

<syntaxhighlight lang="bash">
-e "ssh -i /path/to/your/private_key"
</syntaxhighlight>

=== How do I use a private key with <code>sftp</code>? ===

Add the following option to your <code>sftp</code> command:

<syntaxhighlight lang="bash">
-i /path/to/your/private_key
</syntaxhighlight>

=== How do I use a private key with FileZilla? ===

Go to FileZilla's '''Site Manager''' and make the following settings in the '''General''' tab. You can leave the port blank, as it defaults to the correct value (22).

* '''Protocol:''' SFTP - SSH File Transfer Protocol
* '''Host:''' ''element''.nmrbox.org
* '''Port:''' Leave blank
* '''Logon Type:''' Key file
* '''User:''' ''username''
* '''Key file:''' ''local path''/.ssh/id_ed25519

=== How do I use a private key with [https://winscp.net WinSCP]? ===

See [https://winscp.net/eng/docs/ui_login_authentication The Authentication Page].

=== How do I <code>scp</code> from a shared account? ===

(Note: This is not an endorsement of shared accounts, but that is a site-specific decision.)

If multiple users are using a shared account (e.g., from a spectrometer console), the following steps will allow copying local data to each user's account. For this example, we assume your username is <code>rernst</code>.

# '''Create another SSH key pair with a passphrase:'''

<syntaxhighlight lang="bash">
ssh-keygen -t ed25519 -C "spectrometer scp"
Generating public/private ed25519 key pair.
Enter file in which to save the key (/Users/rernst/.ssh/id_ed25519): id_ed25519rernst
Enter passphrase (empty for no passphrase): <type a password>
Enter same passphrase again: <retype the password>
Your identification has been saved in id_ed25519rernst
Your public key has been saved in id_ed25519rernst.pub
</syntaxhighlight>

# '''Add''' the contents of <code>id_ed25519rernst.pub</code> to [https://nmrbox.nmrhub.org/user-dashboard/ssh-key NMRbox User Dashboard SSH Key].

# Go to the home directory of the shared account. Create an <code>.ssh</code> directory if necessary and ensure it has permissions <code>drwx------</code>:

<syntaxhighlight lang="bash">
cd $HOME
mkdir -p .ssh
chmod 700 .ssh
</syntaxhighlight>

# Create or edit <code>~/.ssh/config</code> and add the following lines:

<syntaxhighlight lang="bash">
Match User rernst Host *.nmrbox.org
IdentityFile ~/.ssh/id_ed25519rernst
</syntaxhighlight>

# You should now be able to copy data from the shared account to <code>nmrbox.org</code>:

<syntaxhighlight lang="bash">
scp fid rernst@*element*.nmrbox.org:
</syntaxhighlight>

When prompted:

<syntaxhighlight lang="text">
Enter passphrase for key 'home_directory/.ssh/id_ed25519rernst':
</syntaxhighlight>

Enter the password you used when creating the key pair.

Main Page/Content building

2025-01-21T20:50:42Z

Gweatherby: Gweatherby moved page Main Page/Content building to Content building: Misspelled title

#REDIRECT [[Content building]]

Content building

2025-01-21T20:50:42Z

Gweatherby: Gweatherby moved page Main Page/Content building to Content building: Misspelled title

The NAN wiki content is available to the public.

Creating and editing pages is limited to users logged into [https://nmrhub.org NMRhub].

Information on categories is at [https://www.mediawiki.org/wiki/Help:Categories Help:Categories].

The *Help about MediaWiki* on the left sidebar link goes to the help page on formatting.

Content building

2025-01-21T20:50:01Z

Gweatherby: Starting tips

Main Page

2025-01-21T16:36:32Z

Gweatherby: /* Welcome to the Network for Advanced NMR (NAN) wiki */ -wiki

== Welcome to the Network for Advanced NMR (NAN) ==

Main Page

2025-01-21T14:41:03Z

Gweatherby: create

== Welcome to the Network for Advanced NMR (NAN) wiki ==