Enabled debugging by adding -d to /etc/init/bluetooth.conf
But I don't understand what exactly is going on and why it fails.

I stripped pid, date (except secs) and hostname from log.

** Attachment added: "debug log"
   
https://bugs.launchpad.net/ubuntu/+source/bluez/+bug/1342568/+attachment/4153829/+files/bluetooth.log

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https://bugs.launchpad.net/bugs/1342568

Title:
  bluetooth connect fails

Status in “bluez” package in Ubuntu:
  New

Bug description:
  I want to connect to a BT-serial adapter. Always get the error
  "Unknown command complete for opcode 37".

  If I supply the correct pin, connection is reported successful, but
  the device immediately disappears.

  I tried three different host BT hardware and two different PCs. always
  the same.

  Kubuntu 14.04
  Bluez-4.101-ubuntu13

  syslog: First with correct pin, second using wrong pin:

  bluetoothd[1107]: Discovery session 0x7f66d5221040 with :1.117 activated
  bluetoothd[1107]: Unknown command complete for opcode 37
  bluetoothd[1107]: Stopping discovery

  bluetoothd[1107]: Discovery session 0x7f66d52209a0 with :1.118 activated
  bluetoothd[1107]: Unknown command complete for opcode 37
  bluetoothd[1107]: Stopping discovery
  bluetoothd[1107]: hci0: Cancel Pair Device (0x001a) failed: Invalid 
Parameters (0x0d) 

  How do I enable more detailed logging?

  I am quite sure this is no duplicate of those BT-suspend bugs. Because
  it always fails and the rfkill workaround doesn't help.

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