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From: John Klug <ski.brimson@gmail.com>
Date: Tue, 14 Nov 2017 15:45:07 -0600
Message-ID: <CADU0VqyM081pHYtNWTxM+ajg-f2-jcs=F_5wCnV5L2_mOQ_TvQ@mail.gmail.com>
Subject: Security block and Bluez 5.47
To: linux-bluetooth@vger.kernel.org
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Sender: linux-bluetooth-owner@vger.kernel.org
List-ID: <linux-bluetooth.vger.kernel.org>

I have tried unblock, and nothing seems to help.

Frequently when I connect my Android phone to my bluez 5.47 device I
see (btmon):

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

                                                            #36 [hci0]
5.709020
         Num handles: 1
         Handle: 1
         Count: 1
 < ACL Data TX: Handle 1 flags 0x00 dlen 16

                                                            #37 [hci0]
5.714589
       L2CAP: Connection Response (0x03) ident 4 len 8
         Destination CID: 64
         Source CID: 81
         Result: Connection refused - security block (0x0003)
         Status: No further information available (0x0000)

This is using connecting from Android 7 to Bluez 5.47.


 [bluetooth]# info DC:74:A8:05:39:77
 Device DC:74:A8:05:39:77
         Name: John Cell Phone
         Alias: John Cell Phone
         Class: 0x005a020c
         Icon: phone
         Paired: yes
         Trusted: yes
         Blocked: no
         Connected: no
         LegacyPairing: no
         UUID: OBEX Object Push          (00001105-0000-1000-8000-00805f9b34fb)
         UUID: Audio Source              (0000110a-0000-1000-8000-00805f9b34fb)
         UUID: A/V Remote Control Target (0000110c-0000-1000-8000-00805f9b34fb)
         UUID: Headset AG                (00001112-0000-1000-8000-00805f9b34fb)
         UUID: PANU                      (00001115-0000-1000-8000-00805f9b34fb)
         UUID: NAP                       (00001116-0000-1000-8000-00805f9b34fb)
         UUID: Handsfree Audio Gateway   (0000111f-0000-1000-8000-00805f9b34fb)
         UUID: Phonebook Access Server   (0000112f-0000-1000-8000-00805f9b34fb)
         UUID: Message Access Server     (00001132-0000-1000-8000-00805f9b34fb)
         UUID: PnP Information           (00001200-0000-1000-8000-00805f9b34fb)
         UUID: Generic Access Profile    (00001800-0000-1000-8000-00805f9b34fb)
         UUID: Generic Attribute Profile (00001801-0000-1000-8000-00805f9b34fb)
         UUID: Vendor specific           (936da01f-9abd-4d9d-80c7-02af85c822a8)
         Modalias: bluetooth:v0075p0100d0200

 [bluetooth]# show
 Controller 00:23:A7:49:67:FB
         Name: MTCDT-pan-Bluez
         Alias: MTCDT-pan-Bluez
         Class: 0x00020000
         Powered: yes
         Discoverable: yes
         Pairable: yes
         UUID: Generic Attribute Profile (00001801-0000-1000-8000-00805f9b34fb)
         UUID: NAP                       (00001116-0000-1000-8000-00805f9b34fb)
         UUID: A/V Remote Control        (0000110e-0000-1000-8000-00805f9b34fb)
         UUID: PnP Information           (00001200-0000-1000-8000-00805f9b34fb)
         UUID: Generic Access Profile    (00001800-0000-1000-8000-00805f9b34fb)
         UUID: A/V Remote Control Target (0000110c-0000-1000-8000-00805f9b34fb)
         Modalias: usb:v1D6Bp0246d052F
         Discovering: no

 $ bluetoothctl -v
 5.47
======================================================