SOLVED Open CIFS share to a specific computer

[dpearcefl]

Reported as a bug just today: https://bugs.freenas.org/issues/14897

After some trial and error, I found that if I changed the Server maximum protocol to "SMB3_00", backups would work and I would be able to create VHD/VHDX files without issue.

 

[anodos]

I tried to reproduce your problem on my server. smbstatus appears to incorrectly report "RDONLY" on guest access to shares.

Code:

[root@freenas] /mnt/Tank/TestShare# smbstatus

Samba version 4.3.6-GIT-UNKNOWN
PID     Username      Group         Machine            Protocol Version
------------------------------------------------------------------------------
25281     guest         nobody        192.168.0.135 (ipv4:192.168.0.135:13353) Unknown (0x0311)

Service      pid     machine       Connected at
-------------------------------------------------------
SQLDumps     25281   192.168.0.135  Thu Apr 21 18:28:37 2016

Locked files:
Pid          Uid        DenyMode   Access      R/W        Oplock           SharePath   Name   Time
--------------------------------------------------------------------------------------------------
25281        1007       DENY_NONE  0x100081    RDONLY     NONE             /mnt/Tank/Test/SQLDumps   .   Thu Apr 21 18:28:37 2016
25281        1007       DENY_NONE  0x100081    RDONLY     NONE             /mnt/Tank/Test/SQLDumps   .   Thu Apr 21 18:31:34 2016
25281        1007       DENY_NONE  0x100081    RDONLY     NONE             /mnt/Tank/Test/SQLDumps   New folder   Thu Apr 21 18:31:34 2016

[root@freenas] /mnt/Tank/TestShare#

Can create folders / files without problems in File Explorer. Perhaps reboot your client and try again.