After pairing, get "Link Key Request Negative Reply"

Hi all,

I have a device with address 00:09:1F:80:12:21, i can pair the device
to Bluez, the linkkeys file contains:

# cat /var/lib/bluetooth/00\:07\:80\:56\:F8\:70/linkkeys
00:09:1F:80:12:21    41F80F349B12603669616D178B0F5974 4 0

from hcidump, the "Link Key Request Negative Reply" is received, then
"Unauthenticated Combination Key" is received, then  "Connection
refused - security block" is received.

Is this a Bluez or device problem?  There is a "Fix l2cap conn
failures for ssp devices", is it related?

Thanks,
Victor


------------------------------- hcidump log
-------------------------------------------
< HCI Command: Authentication Requested (0x01|0x0011) plen 2
    handle 43

HCI Event: Command Status (0x0f) plen 4

    Authentication Requested (0x01|0x0011) status 0x00 ncmd 1

HCI Event: Link Key Request (0x17) plen 6

    bdaddr 00:09:1F:80:12:21
< HCI Command: Link Key Request Negative Reply (0x01|0x000c) plen 6
    bdaddr 00:09:1F:80:12:21

HCI Event: Command Complete (0x0e) plen 10

    Link Key Request Negative Reply (0x01|0x000c) ncmd 1
    status 0x00 bdaddr 00:09:1F:80:12:21
......

HCI Event: User Confirmation Request (0x33) plen 10

    bdaddr 00:09:1F:80:12:21 passkey 912806
< HCI Command: User Confirmation Request Reply (0x01|0x002c) plen 6
    bdaddr 00:09:1F:80:12:21

HCI Event: Command Complete (0x0e) plen 10

    User Confirmation Request Reply (0x01|0x002c) ncmd 1
    status 0x00 bdaddr 00:09:1F:80:12:21

HCI Event: Simple Pairing Complete (0x36) plen 7

    status 0x00 bdaddr 00:09:1F:80:12:21

HCI Event: Link Key Notification (0x18) plen 23

    bdaddr 00:09:1F:80:12:21 key F8BA145BCB649DCA8948D3110D6A19D6 type 4
    Type: Unauthenticated Combination Key

HCI Event: Auth Complete (0x06) plen 3

    status 0x00 handle 43
.....
< ACL data: handle 43 flags 0x02 dlen 12
    L2CAP(s): Connect req: psm 1 scid 0x0040

HCI Event: Number of Completed Packets (0x13) plen 5

    handle 43 packets 1

ACL data: handle 43 flags 0x02 dlen 16

    L2CAP(s): Connect rsp: dcid 0x0040 scid 0x0040 result 1 status 2
      Connection pending - Authorization pending

ACL data: handle 43 flags 0x02 dlen 16

    L2CAP(s): Connect rsp: dcid 0x0040 scid 0x0040 result 0 status 0
      Connection successful
.......

ACL data: handle 43 flags 0x02 dlen 12

    L2CAP(s): Connect req: psm 4097 scid 0x0041
< ACL data: handle 43 flags 0x02 dlen 16
    L2CAP(s): Connect rsp: dcid 0x0000 scid 0x0041 result 3 status 0
      Connection refused - security block