Unable to mount NAS via command line on Ubuntu 24.04

[thenewdev]

Hi All,

Looking for a little bit of help!
I'm attempting to mount an old WD My Live Book Duo network storage drive (FILESRV01) to my Ubuntu server with a mount point of /mnt/nas but can't seem to get it to work.

Attempted:

sudo mount -t cifs //FILESRV01.local/data /mnt/nas
sudo mount -t cifs //FILESRV01.local/data /mnt/nas -o username=XXXX
sudo mount -t cifs //FILESRV01.local/data /mnt/nas -o username=XXXX,domain=WORKGROUP
sudo mount -t cifs //192.168.X.X/data /mnt/nas
sudo mount -t cifs //192.168.X.X/data /mnt/nas -o username=XXXX
sudo mount -t cifs //192.168.X.X/data /mnt/nas -o username=XXXX,domain=WORKGROUP
sudo mount -t cifs //192.168.X.X/data /mnt/nas -o username=WORKGROUP/XXXX

Alongside every other variant including gid, uid, etc...
Also attempted mounting via

smbclient -L

All of which return mount error(22): Invalid argument

Checking dmesg displays:

CIFS: VFS: cifs_mount failed w/return code = -22

-
In troubleshooting, I went ahead and installed Ubuntu Desktop to use the GUI - which sees and mounts the drive just fine without any additional work.


https://imgur.com/a/XMe3rQ9

But even after confirming that it could mount via the GUI - attempting to mount via command line on the Desktop version still gives return code -22

Via

smbclient -L

the server confirms that it can see the shares and does list them
https://imgur.com/QR0u9Qz


I've tried every other mount option I could find out there and still nothing.
Any guidance is really appreciated, thanks!

[Morbius1]

Most of the time an "invalid option" error usually indicates the client is trying to access the server with a smb dialect the server doesn't understand.

By default mount.cifs will try to access the server with smb dialects between 2.1 and 3.11. If the server is that old it may not unserstand anything in that range.

You can override the cifs defaults by using the vers= option.


sudo mount -t cifs //FILESRV01.local/data /mnt/nas -o username=XXXX,vers=2.0

Or

sudo mount -t cifs //FILESRV01.local/data /mnt/nas -o username=XXXX,vers=1.0

[thenewdev]

Morbius - thank you SO much. That did it!
This one resolved my issue -

sudo mount -t cifs //FILESRV01.local/data /mnt/nas -o username=XXXX,vers=1.0

I really appreciate your help.

[TheFu]

ver 1 is terribly non-secure. If you want to KNOW which protocols your NAS will support, use the nmap tool:

$ sudo nmap --script smb-protocols    win7ult
Starting Nmap 7.80 ( https://nmap.org ) at 2024-06-13 09:46 EDT
Nmap scan report for win7ult (172.22.22.8)
Host is up (0.00078s latency).
Not shown: 995 filtered ports
PORT      STATE SERVICE
135/tcp   open  msrpc
139/tcp   open  netbios-ssn
445/tcp   open  microsoft-ds
5357/tcp  open  wsdapi
49156/tcp open  unknown
MAC Address: 52:54:00:7B:8A:14 (QEMU virtual NIC)

Host script results:
| smb-protocols: 
|   dialects: 
|     NT LM 0.12 (SMBv1) [dangerous, but default]
|     2.02
|_    2.10

Nmap done: 1 IP address (1 host up) scanned in 11.84 seconds

Just replace the underlined part with the IP address of your NAS. I have DNS running here, so the IP lookup happens that way, but a normal IP address can be used too.

When I connect to that CIFS share, I use vers=2.1. It is the highest, supported, value. Win10+ should be using version 3+ which are drastically more secure than prior versions. There's only so much we can do. Any NAS that only supports v1 really is ready to be retired. Something to work into your plans.

[thenewdev]

Thanks for this! My NAS didn't support 2.1, but it did have Version 2 and so I switched commands to

sudo mount -t cifs //FILESRV01.local/data /mnt/nas -o username=XXXX,vers=2.0

instead.

Thanks!

[aoakley]

Hi, jotting this down here as it's a top hit for "ubuntu 24.04 cifs mount bad option". I encountered this error after upgrading from Ubuntu 22.04 to 24.04 . dmesg shows "bad value for password". It was caused by the password option being blank. The solution is simply to omit the password option.

This /etc/fstab entry was valid in 22.04:

//192.168.0.249/FamilyLibrary /mnt/bigpenguin cifs x-systemd.automount,auto,nofail,nounix,username=gues t,password=,uid=nobody,gid=sambashare,file_mode=06 60,dir_mode=0770 0 0

(note ,password=, )

...but it had to be changed to the following to work in 24.04:

//192.168.0.249/FamilyLibrary /mnt/bigpenguin cifs x-systemd.automount,auto,nofail,nounix,username=gues t,uid=nobody,gid=sambashare,file_mode=0660,dir_mod e=0770 0 0