Connection failures on Ubuntu

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I'm not able to connect to a service running on Ubuntu 15.10. The
system-provided BlueZ version is 5.35.

I can reproduce it using the test scripts. On Ubuntu:

./test-profile -s -u b85280dd-b78a-4a45-be4b-b6fec4abd86f -n "Test Server" -C 5

sdptool shows the service:

Service Name: Test Server
Service RecHandle: 0x10009
Service Class ID List:
  UUID 128: b85280dd-b78a-4a45-be4b-b6fec4abd86f
Protocol Descriptor List:
  "L2CAP" (0x0100)
  "RFCOMM" (0x0003)
    Channel: 5

On a different host (this one running Fedora 22 with BlueZ 5.29), I
start a client:

./test-profile -u b85280dd-b78a-4a45-be4b-b6fec4abd86f -c

and then

./test-device connect <ubuntu-addr> b85280dd-b78a-4a45-be4b-b6fec4abd86f
Traceback (most recent call last):
  File "./test-device", line 104, in <module>
    device.ConnectProfile(args[2])
  File "/usr/lib64/python2.7/site-packages/dbus/proxies.py", line 70,
in __call__
    return self._proxy_method(*args, **keywords)
  File "/usr/lib64/python2.7/site-packages/dbus/proxies.py", line 145,
in __call__
    **keywords)
  File "/usr/lib64/python2.7/site-packages/dbus/connection.py", line
651, in call_blocking
    message, timeout)
dbus.exceptions.DBusException: org.bluez.Error.Failed: Connection refused

Other times I will get:

dbus.exceptions.DBusException: org.bluez.Error.Failed: Resource
temporarily unavailable

These hosts are already paired. Things work fine when both hosts are
using Fedora 22.

Any suggestions on how I can diagnose this further?

Thanks,
Mark
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