Cannot log in into samba share with smbclient but mount it via cifs

Question

The problem

We have a NAS, which I can easily mount via CIFS, but I cannot access it via smbclient. On the NAS itself I have very little influence. I just got a permission for a set of shares there.

What works

The mount via fstab works flawlessly via

//nasname.local/someshare /mnt/someshare cifs credentials=/home/.cifs/cifscredentials,iocharset=utf8,dir_mode=0777,file_mode=0777 0 0

I can also list the shares via smbclient via smbclient -L //nasname.local/ -N when i log in anonymously

Anonymous login successful

    Sharename       Type      Comment
    ---------       ----      -------
    IPC$            IPC       IPC Service (NAS Server)
    Backup          Disk      
    Public          Disk      System default share
    Web             Disk      System default share
Reconnecting with SMB1 for workgroup listing.
Anonymous login successful

    Server               Comment
    ---------            -------

    Workgroup            Master
    ---------            -------
    WORKGROUP            xxx

What doesnt work

I take now the same credentials to log into the NAS via smbclient smbclient //nasname.local/someshare -U username and the the password, but I get the response

Enter WORKGROUP\username's password: 
tree connect failed: NT_STATUS_ACCESS_DENIED

So I'd like to know, what the problem could be, that a cifs-mount works but a connection via smbclient doesnt.

Solution c.f. further below

Answer 1

I was now able to get it work via

• Providing the credentials in a file, looking like

  username = my_user_name
  password = my_secret_password
  

• calling the smbclient via

  smbclient //nasname.local/Web -A /my/credentials/file
  

And it's important, that in the file on uses username instead of only user (eventhough the latter works if one mounts via sudo mount -t cifs)