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I want to connect to the linux computer with bluetooth adapter, however after connection connected device automatically disconnects after about 3 sec.

Here is some output from journalctl -u bluetooth:

Sep 08 13:47:30 router bluetoothd[436]: src/adapter.c:connected_callback() hci0 device 6C:40:08:93:F2:A3 connected eir_len 15
Sep 08 13:47:31 router bluetoothd[436]: src/adapter.c:new_link_key_callback() hci0 new key for 6C:40:08:93:F2:A3 type 4 pin_len 0 store_hint 1
Sep 08 13:47:31 router bluetoothd[436]: src/device.c:device_set_bonded()
Sep 08 13:47:31 router bluetoothd[436]: src/device.c:device_bonding_complete() bonding (nil) status 0x00
Sep 08 13:47:31 router bluetoothd[436]: src/adapter.c:resume_discovery()
Sep 08 13:47:35 router bluetoothd[436]: src/adapter.c:dev_disconnected() Device 6C:40:08:93:F2:A3 disconnected, reason 2
Sep 08 13:47:35 router bluetoothd[436]: src/adapter.c:adapter_remove_connection()
Sep 08 13:47:35 router bluetoothd[436]: plugins/policy.c:disconnect_cb() reason 2
Sep 08 13:47:35 router bluetoothd[436]: src/adapter.c:bonding_attempt_complete() hci0 bdaddr 6C:40:08:93:F2:A3 type 0 status 0xe
Sep 08 13:47:35 router bluetoothd[436]: src/device.c:device_bonding_complete() bonding (nil) status 0x0e
Sep 08 13:47:35 router bluetoothd[436]: src/device.c:device_bonding_failed() status 14
Sep 08 13:47:35 router bluetoothd[436]: src/adapter.c:resume_discovery()

I've tried to connect from several devices (two macbook's computer, one windows computer, iphone and android phone) and two bluetooth adapters installed in linux computer (intel 7260 wifi/bluetooth adapter and TP-Link UB400 usb bluetooth adapter).

What should I do to understand why connected devices disconnects?

kernel version: 4.9.0-11-686-pae

debian version: 9.10

bluez version: 5.43-2

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