From: John Kendall <john@capps.com>
To: "linux-cifs@vger.kernel.org" <linux-cifs@vger.kernel.org>
Subject: mount.smb3 error 0xc00000bb STATUS_NOT_SUPPORTED
Date: Mon, 23 Feb 2026 21:37:03 +0000 [thread overview]
Message-ID: <CDC5B65B-2116-4FEF-AF59-AA41DBE2072B@capps.com> (raw)
I hope this is a quick one. Thanks in advance.
John
kernel
5.14.0-611.30.1.el9_7.x86_64
= = = = = = = = = = = =
smbclient command (v4.22.4)
smbclient -A /etc/silomountuserpw //silo-azwest-fs.verqhaus.com/Invoices <http://cai-azwest-fs.capps.com/Invoices>
works!
= = = = = = = = = = = =
mount command (v7.2)
mount --verbose -t smb3 //silo-azwest-fs.verqhaus.com/Invoices /mnt -o cred=/etc/silomountuserpw
returns:
Host "silo-azwest-fs.verqhaus.com" resolved to the following IP addresses: 10.4.0.37
mount.smb3 kernel mount options: ip=10.4.0.37,unc=\\silo-azwest-fs.verqhaus.com\Invoices,user=silomountuser@verqhaus.com,domain=verqhaus.com,pass=********
mount error(95): Operation not supported
Refer to the mount.smb3(8) manual page (e.g. man mount.smb3) and kernel log messages (dmesg)
dmesg output with debuggin turned on:
[ 9733.032860] CIFS: fs/smb/client/fs_context.c: CIFS: parsing cifs mount option 'source'
[ 9733.032902] CIFS: fs/smb/client/fs_context.c: CIFS: parsing cifs mount option 'ip'
[ 9733.032914] CIFS: fs/smb/client/fs_context.c: CIFS: parsing cifs mount option 'unc'
[ 9733.032919] CIFS: fs/smb/client/fs_context.c: CIFS: parsing cifs mount option 'user'
[ 9733.032922] CIFS: fs/smb/client/fs_context.c: CIFS: parsing cifs mount option 'domain'
[ 9733.032925] CIFS: fs/smb/client/fs_context.c: Domain name set
[ 9733.032928] CIFS: fs/smb/client/fs_context.c: CIFS: parsing cifs mount option 'pass'
[ 9733.032931] CIFS: fs/smb/client/cifsfs.c: cifs_smb3_do_mount: devname=//silo-azwest-fs.verqhaus.com/Invoices flags=0x0
[ 9733.032937] CIFS: fs/smb/client/connect.c: file mode: 0755 dir mode: 0755
[ 9733.032942] CIFS: fs/smb/client/connect.c: VFS: in cifs_mount_get_session as Xid: 105 with uid: 0
[ 9733.032947] CIFS: fs/smb/client/connect.c: UNC: \\silo-azwest-fs.verqhaus.com\Invoices
[ 9733.032951] CIFS: fs/smb/client/connect.c: generic_ip_connect: connecting to 10.4.0.37:445
[ 9733.032963] CIFS: fs/smb/client/connect.c: Socket created
[ 9733.032966] CIFS: fs/smb/client/connect.c: sndbuf 16384 rcvbuf 131072 rcvtimeo 0x1b58
[ 9733.035235] CIFS: fs/smb/client/connect.c: VFS: in cifs_get_smb_ses as Xid: 106 with uid: 0
[ 9733.035241] CIFS: fs/smb/client/connect.c: Existing smb sess not found
[ 9733.035244] CIFS: fs/smb/client/connect.c: Demultiplex PID: 97842
[ 9733.035251] CIFS: fs/smb/client/smb2pdu.c: Negotiate protocol
[ 9733.035259] CIFS: fs/smb/client/transport.c: wait_for_free_credits: remove 1 credits total=0
[ 9733.035271] CIFS: fs/smb/client/transport.c: Sending smb: smb_len=260
[ 9733.035925] CIFS: fs/smb/client/connect.c: RFC1002 header 0x134
[ 9733.035937] CIFS: fs/smb/client/smb2misc.c: SMB2 data length 120 offset 128
[ 9733.035940] CIFS: fs/smb/client/smb2misc.c: SMB2 len 248
[ 9733.035944] CIFS: fs/smb/client/smb2misc.c: length of negcontexts 60 pad 0
[ 9733.035948] CIFS: fs/smb/client/smb2ops.c: smb2_add_credits: added 1 credits total=1
[ 9733.035973] CIFS: fs/smb/client/transport.c: cifs_sync_mid_result: cmd=0 mid=0 state=64
[ 9733.035986] CIFS: fs/smb/client/misc.c: Null buffer passed to cifs_small_buf_release
[ 9733.035995] CIFS: fs/smb/client/smb2pdu.c: mode 0x3
[ 9733.035997] CIFS: fs/smb/client/smb2pdu.c: negotiated smb3.1.1 dialect
[ 9733.036006] CIFS: fs/smb/client/asn1.c: Decoding negTokenInit: unsupported OID 1.3.6.1.4.1.311.2.2.30
[ 9733.036015] CIFS: fs/smb/client/smb2pdu.c: decoding 2 negotiate contexts
[ 9733.036020] CIFS: fs/smb/client/smb2pdu.c: decode SMB3.11 encryption neg context of len 4
[ 9733.036034] CIFS: fs/smb/client/smb2pdu.c: SMB311 cipher type:2
[ 9733.036046] CIFS: fs/smb/client/connect.c: cifs_setup_session: channel connect bitmap: 0x1
[ 9733.036052] CIFS: fs/smb/client/connect.c: Security Mode: 0x3 Capabilities: 0x300067 TimeAdjust: 0
[ 9733.036055] CIFS: fs/smb/client/smb2pdu.c: Session Setup
[ 9733.036060] CIFS: fs/smb/client/smb2pdu.c: sess setup type 2
[ 9733.036064] CIFS: fs/smb/client/smb2pdu.c: Fresh session. Previous: 0
[ 9733.036068] CIFS: fs/smb/client/transport.c: wait_for_free_credits: remove 1 credits total=0
[ 9733.036076] CIFS: fs/smb/client/transport.c: Sending smb: smb_len=136
[ 9733.036557] CIFS: fs/smb/client/connect.c: RFC1002 header 0x11c
[ 9733.036581] CIFS: fs/smb/client/smb2misc.c: SMB2 data length 212 offset 72
[ 9733.036597] CIFS: fs/smb/client/smb2misc.c: SMB2 len 284
[ 9733.036613] CIFS: fs/smb/client/smb2ops.c: smb2_add_credits: added 1 credits total=1
[ 9733.036655] CIFS: fs/smb/client/transport.c: cifs_sync_mid_result: cmd=1 mid=1 state=64
[ 9733.036678] CIFS: Status code returned 0xc0000016 STATUS_MORE_PROCESSING_REQUIRED
[ 9733.036694] CIFS: fs/smb/client/smb2maperror.c: Mapping SMB2 status code 0xc0000016 to POSIX err -5
[ 9733.036704] CIFS: fs/smb/client/misc.c: Null buffer passed to cifs_small_buf_release
[ 9733.036709] CIFS: fs/smb/client/sess.c: decode_ntlmssp_challenge: negotiate=0xe2088235 challenge=0xe2898235
[ 9733.036715] CIFS: fs/smb/client/smb2pdu.c: rawntlmssp session setup challenge phase
[ 9733.036719] CIFS: fs/smb/client/smb2pdu.c: Fresh session. Previous: 0
[ 9733.036762] CIFS: fs/smb/client/transport.c: wait_for_free_credits: remove 1 credits total=0
[ 9733.036777] CIFS: fs/smb/client/transport.c: Sending smb: smb_len=508
[ 9733.041144] CIFS: fs/smb/client/connect.c: RFC1002 header 0x48
[ 9733.041219] CIFS: fs/smb/client/smb2misc.c: SMB2 data length 0 offset 0
[ 9733.041224] CIFS: fs/smb/client/smb2misc.c: SMB2 len 73
[ 9733.041249] CIFS: fs/smb/client/smb2ops.c: smb2_add_credits: added 1 credits total=1
[ 9733.041294] CIFS: fs/smb/client/transport.c: cifs_sync_mid_result: cmd=1 mid=2 state=64
[ 9733.041315] CIFS: Status code returned 0xc00000bb STATUS_NOT_SUPPORTED
[ 9733.041330] CIFS: fs/smb/client/smb2maperror.c: Mapping SMB2 status code 0xc00000bb to POSIX err -95
[ 9733.041334] CIFS: fs/smb/client/misc.c: Null buffer passed to cifs_small_buf_release
[ 9733.041339] CIFS: VFS: \\silo-azwest-fs.verqhaus.com Send error in SessSetup = -95
[ 9733.041345] CIFS: fs/smb/client/connect.c: VFS: leaving cifs_get_smb_ses (xid = 106) rc = -95
[ 9733.041367] CIFS: fs/smb/client/connect.c: VFS: leaving cifs_mount_put_conns (xid = 105) rc = 0
[ 9733.041371] CIFS: VFS: cifs_mount failed w/return code = -95
next reply other threads:[~2026-02-23 21:37 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-23 21:37 John Kendall [this message]
[not found] ` <CAH2r5mu15UrSSiFu6fvA7t_2KmxZG80o50nqNwr17Afk7_9Svg@mail.gmail.com>
2026-02-24 4:56 ` mount.smb3 error 0xc00000bb STATUS_NOT_SUPPORTED John Kendall
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