[Samba] Samba mount error after server packages update

[Andrew Walker]

On Wed, Jul 15, 2020 at 1:52 PM andy via samba <samba at lists.samba.org>
wrote:

> Hello,
> I've a virtual machine working as a samba server ("clear linux release
> 28640", whose relevant information are in the attached file
> "server_clearmi_28640.txt").
>
> The samba client is an android 4 virtual machine (
> https://www.android-x86.org/releases/releasenote-4-4-r5.html).
> I can succesfully mount samba shares from the android "terminal emulator",
> with the following command, for example:
> ---
> # android_share
> su root busybox mount -v -t cifs \
> -o
> username=andy,password=pass,nounix,nosuid,nodev,noexec,noatime,gid=10028,uid=10023,rw
> \
> //192.168.213.133/android_share /sdcard/android_share
> ---
> So far so good.
>
> Now I have just upgraded the server machine to "clear linux release
> 33490". Only the full system upgrade has been performed, with no other
> changes.
> After the upgrade, the samba version has been updated from 4.10.0 to
> 4.12.3.
> The samba server starts correctly (and it works correctly with windows
> clients), but when I try to mount the filesystem on the android client
> (with the same command shown before), I get the following error:
> "operation not supported on transport endpoint".
>
> I don't understand if this is a bug in the new server, or if the updated
> samba release requires different parameters in the smb.conf file.
> Any suggestion?
> Andy--
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In samba 4.11 the default server minimum protocol was increased to SMB3_02.
Perhaps your client requires SMB1 (NT1)?
https://www.samba.org/samba/docs/current/man-html/smb.conf.5.html#SERVERMINPROTOCOL