mount.cifs operation not supported but smbclient connects as expected

Question

When mounting OSX 10.9.5 shares on Debian 8.2 with mount.cifs ver. 6.4:

mount error(95): Operation not supported

Credentials are not the issue. I can access them via smbclient. Mount reads domain and username from the credentials file correctly. I am running as root, so hopefully not a permissions issue.

The only difference I can find is in the flags reported in /var/log/system.log on the file sharing host. Accessing with mount.cifs lists no flags, smbclient lists a few. But the mount.cifs is working on another machine (archlinux) and also has no flags.

 # smb client works fine
 smbclient \\\\arnold\\T800 -A ~ni_tools/passwd/arnold 
   Domain=[ARNOLD] OS=[Darwin] Server=[@(#)PROGRAM:smbd  PROJECT:smbx-276.92.2]
   smb: \> 

# mount
sudo mount -t cifs //arnold/T800 test -o credentials=~ni_tools/passwd/arnold,iocharset=utf8,uid=1000,gid=1000,rw -vv
  domain=ARNOLD
  mount.cifs kernel mount options: ip=157.229.27.130,unc=\\arnold\T800,iocharset=utf8,uid=1000,gid=1000,user=lncd,,domain=ARNOLD,pass=********
  mount error(95): Operation not supported
  Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)

 # get more info
 echo 1 > /proc/fs/cifs/traceSMB
 echo 1 > /proc/fs/cifs/cifsFYI

 # whats going on? I don't know 
 dmesg |tail
  [278115.106815] | 0x00 0x00 0x00 0x00 0x01 0x01 0x00 0x01  |  _ _ _ _ _ _ _ _
  [278115.106821] | 0x00 0x61                                |  _ a            
  [278115.107104] /build/linux-x1KGLI/linux-3.16.7-ckt11/fs/cifs/connect.c: RFC1002 header 0x26
  [278115.107115] | 0x00 0x00 0x00 0x26 0xff 0x53 0x4d 0x42  |  _ _ _ & \xffffffff S M B
  [278115.107123] | 0x2b 0x00 0x00 0x00 0x00 0x80 0x01 0x48  |  + _ _ _ _ _ _ H
  [278115.107129] | 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00  |  _ _ _ _ _ _ _ _
  [278115.107135] | 0x00 0x00 0x00 0x00 0xff 0xff 0x5c 0x04  |  _ _ _ _ \xffffffff \xffffffff \ _
  [278115.107141] | 0x00 0x00 0x00 0x00 0x01 0x01 0x00 0x01  |  _ _ _ _ _ _ _ _
  [278115.107146] | 0x00 0x61                                |  _ a            
  [278115.107157] /build/linux-x1KGLI/linux-3.16.7-ckt11/fs/cifs/misc.c: checkSMB Length: 0x2a, smb_buf_length: 0x26

---

arnold: /var/log/system.log

###  Successful mount from archlinux ###
Dec 17 15:11:42 arnold.wpic.upmc.edu digest-service[54605]: digest-request: uid=0
Dec 17 15:11:42 arnold.wpic.upmc.edu digest-service[54605]: digest-request: init request
Dec 17 15:11:42 arnold.wpic.upmc.edu digest-service[54605]: digest-request: init return domain: ARNOLD server: ARNOLD indomain was: <NULL>
Dec 17 15:11:42 arnold.wpic.upmc.edu digest-service[54605]: digest-request: uid=0
Dec 17 15:11:42 arnold.wpic.upmc.edu digest-service[54605]: digest-request: od failed with 2 proto=ntlmv2
Dec 17 15:11:42 arnold.wpic.upmc.edu digest-service[54605]: digest-request: user=ARNOLD\lncd
Dec 17 15:11:42 arnold.wpic.upmc.edu digest-service[54605]: digest-request kdc: ok user=ARNOLD\lncd proto=ntlmv2 flags: 

###  FAILED MOUNT ATTEMPT ###
Dec 17 14:39:11 arnold.wpic.upmc.edu digest-service[54210]: digest-request: uid=0
Dec 17 14:39:11 arnold.wpic.upmc.edu digest-service[54210]: digest-request: init request
Dec 17 14:39:11 arnold.wpic.upmc.edu digest-service[54210]: digest-request: init return domain: ARNOLD server: ARNOLD indomain was: <NULL>
Dec 17 14:39:11 arnold.wpic.upmc.edu digest-service[54210]: digest-request: uid=0
Dec 17 14:39:11 arnold.wpic.upmc.edu digest-service[54210]: digest-request: init request
Dec 17 14:39:11 arnold.wpic.upmc.edu digest-service[54210]: digest-request: init return domain: ARNOLD server: ARNOLD indomain was: <NULL>
Dec 17 14:39:11 arnold.wpic.upmc.edu digest-service[54210]: digest-request: uid=0
Dec 17 14:39:11 arnold.wpic.upmc.edu digest-service[54210]: digest-request: init request
Dec 17 14:39:11 arnold.wpic.upmc.edu digest-service[54210]: digest-request: init return domain: ARNOLD server: ARNOLD indomain was: <NULL>
Dec 17 14:39:11 arnold.wpic.upmc.edu digest-service[54210]: digest-request: uid=0
Dec 17 14:39:11 arnold.wpic.upmc.edu digest-service[54210]: digest-request: od failed with 2 proto=ntlmv2
Dec 17 14:39:11 arnold.wpic.upmc.edu digest-service[54210]: digest-request: user=ARNOLD\lncd
Dec 17 14:39:11 arnold.wpic.upmc.edu digest-service[54210]: digest-request kdc: ok user=ARNOLD\lncd proto=ntlmv2 flags: 

### SMBCLIENT #####
Dec 17 14:57:48 arnold.wpic.upmc.edu digest-service[54353]: digest-request: uid=0
Dec 17 14:57:48 arnold.wpic.upmc.edu digest-service[54353]: digest-request: init request
Dec 17 14:57:48 arnold.wpic.upmc.edu digest-service[54353]: digest-request: init return domain: ARNOLD server: ARNOLD indomain was: <NULL>
Dec 17 14:57:48 arnold.wpic.upmc.edu digest-service[54353]: digest-request: uid=0
Dec 17 14:57:48 arnold.wpic.upmc.edu digest-service[54353]: digest-request: od failed with 2 proto=ntlmv2
Dec 17 14:57:48 arnold.wpic.upmc.edu digest-service[54353]: digest-request: user=WORKGROUP\lncd
Dec 17 14:57:48 arnold.wpic.upmc.edu digest-service[54353]: digest-request kdc: ok user=ARNOLD\lncd proto=ntlmv2 flags: NEG_KEYEX, ENC_128, NEG_NTLM2, NEG_ALWAYS_SIGN, NEG_NTLM, NEG_SIGN, NEG_TARGET, NEG_UNICODE

Solution

OSX's samba server (SMBX) requires mounting with options nounix,sec=ntlmssp,noperm

https://stackoverflow.com/questions/26000289/debian-7-fstab-mount-cifs-invalid-argument

Comments

[Pol Hallen]

are uid and gid corrects?

[Will]

I think so. 1000 is the gid and uid of the lcnd user grep 1000 /etc/passwd |sed 1q yields lncd:x:1000:1000:LNCD,,,:/home/lncd:/bin/bash