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[Daniel Essin <1896699@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

The following command works:
mount -t cifs //192.168.1.200/Drive_E /mnt/server_e -o credentials=/root/.smbcredentials_server 

The following fstab entry fails:
//server/Server_E /mnt/server_e   cifs   uid=0,credentials=/root/.smbcredentials_server,file_mode=0755,dir_mode=0755,vers=2.1,sec=ntlmssp  0  0

There is an entry in hosts for server. It also fails with //192.168.1.200/Server_E
Sometimes it says:
No dialect specified on mount. Default has changed to a more secure dialect, SMB2.1 or later (e.g. SMB3), from CIFS (SMB1). To use the less secure SMB1 dialect to access old servers which do not support SMB3 (or SMB2.1) specify vers=1.0 on mount.
[ 2079.955734] CIFS VFS:  BAD_NETWORK_NAME: \\192.168.1.200\Server_E
CIFS VFS: cifs_mount failed w/return code = -2

trying vers=1.0 and vers=3.0 makes no difference.

There is no documentations of CIFS VFS error codes
There is no documentation of how to specify the SMB dialect.
People appear to have been having trouble with these things for at least the past 10 years.

I never had a problem with this on debian.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: samba 2:4.11.6+dfsg-0ubuntu1.4
ProcVersionSignature: Ubuntu 5.4.0-47.51-generic 5.4.55
Uname: Linux 5.4.0-47-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia ufsd
ApportVersion: 2.20.11-0ubuntu27.8
Architecture: amd64
CIFSMounts: /root/smb4k/192.168.1.200/Drive_E //192.168.1.200/Drive_E cifs   rw,relatime,vers=3.1.1,cache=strict,username=essin,domain=WORKGROUP,uid=0,forceuid,gid=0,forcegid,addr=192.168.1.200,file_mode=0755,dir_mode=0755,soft,nounix,serverino,mapposix,rsize=4194304,wsize=4194304,bsize=1048576,echo_interval=60,actimeo=1
CasperMD5CheckResult: skip
CurrentDesktop: XFCE
Date: Tue Sep 22 17:35:02 2020
InstallationDate: Installed on 2020-09-18 (4 days ago)
InstallationMedia: Xubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
ProcEnviron:
 LANGUAGE=en_US
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SambaClientRegression: Yes
SourcePackage: samba
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: samba (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal

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https://bugs.launchpad.net/bugs/1896699

Title:
  Mounting a share in fstab fails with BAD_NETWORK_NAME

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