Trouble mounting cifs share

[Franz Geffke <franz@dkkma.com>]

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I'm having trouble mounting cifs; Initially I thought it's a network issue of 
some sort, but it happens on a number of systems and I assume the Hetzner 
Storagebox is OK (as in, configured correctly):

- 2x 6.6.2-gnu Guix: Failed
- 1x 6.1.0-13 Debian: Failed
- 1x 5.10.0-21 Debian: Success

Here's what I'm trying (always as root):

```
mount.cifs -o user=abc,pass=abc //abc.your-storagebox.de/backup /mnt/storage-box
```

SUCCESS:

```
[22217175.369726] FS-Cache: Loaded
[22217175.370661] Key type dns_resolver registered
[22217175.425899] FS-Cache: Netfs 'cifs' registered for caching
[22217175.428484] Key type cifs.spnego registered
[22217175.428593] Key type cifs.idmap registered
[22217175.428940] CIFS: Attempting to mount //abc.your-storagebox.de/backup
[22217175.429066] CIFS: No dialect specified on mount. Default has changed to a 
more secure dialect, SMB2.1 or later (e.g. SMB3.1.1), from CIFS (SMB1). To use 
the less secure SMB1 dialect to access old servers which do not support SMB3.1.1 
(or even SMB3 or SMB2.1) specify vers=1.0 on mount.
```

FAILURE:


```
mount.cifs -o user=abc,pass=abc //abc.your-storagebox.de/backup /mnt/storage-box
mount error(2): No such file or directory
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs) and kernel log 
messages (dmesg)
```

dmesg first run:

```
[   47.720337] FS-Cache: Loaded
[   47.832455] Key type cifs.spnego registered
[   47.832480] Key type cifs.idmap registered
[   47.833652] CIFS: No dialect specified on mount. Default has changed to a 
more secure dialect, SMB2.1 or later (e.g. SMB3.1.1), from CIFS (SMB1). To use 
the less secure SMB1 dialect to access old servers which do not support SMB3.1.1 
(or even SMB3 or SMB2.1) specify vers=1.0 on mount.
[   47.833657] CIFS: Attempting to mount //u379354.your-storagebox.de/backup
[   47.834369] CIFS: VFS: cifs_mount failed w/return code = -2
```

dmesg second run:

```
[84327.549100] CIFS: Attempting to mount //abc.your-storagebox.de/backup
[84327.549388] CIFS: VFS: cifs_mount failed w/return code = -2
```

third one, directly after 2nd:

```
mount.cifs -o user=abc,pass=abc //abc.your-storagebox.de/backup /mnt/storage-box
mount error(126): Required key not available
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs) and kernel log 
messages (dmesg)
```

dmesg third run:

```
[84355.299014] CIFS: Attempting to mount //abc.your-storagebox.de/backup
[84355.299032] CIFS: VFS: cifs_mount failed w/return code = -126
```

Am I missing something? Thank you.

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