AMQP server localhost:5672 closed the connection. Check login credentials: Socket closed

root@ruiy-controller-a:/var/log/nova# apt-get upgrade rabbitmq-server
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
rabbitmq-server is already the newest version.
The following packages will be upgraded:
  libcgmanager0 screen
2 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 567 kB of archives.
After this operation, 67.6 kB of additional disk space will be used.
Do you want to continue? [Y/n] y
WARNING: The following packages cannot be authenticated!
  libcgmanager0 screen
Install these packages without verification? [y/N] y
Get:1 http://hk.archive.ubuntu.com/ubuntu/ trusty-backports/main libcgmanager0 amd64 0.39-2ubuntu2~ubuntu14.04.1 [34.2 kB]
Get:2 http://hk.archive.ubuntu.com/ubuntu/ trusty-backports/main screen amd64 4.2.1-2~ubuntu14.04.1 [533 kB]
Fetched 567 kB in 11s (48.5 kB/s)
(Reading database ... 101898 files and directories currently installed.)
Preparing to unpack .../libcgmanager0_0.39-2ubuntu2~ubuntu14.04.1_amd64.deb ...
Unpacking libcgmanager0:amd64 (0.39-2ubuntu2~ubuntu14.04.1) over (0.24-0ubuntu7.5) ...
Preparing to unpack .../screen_4.2.1-2~ubuntu14.04.1_amd64.deb ...
Unpacking screen (4.2.1-2~ubuntu14.04.1) over (4.1.0~20120320gitdb59704-9) ...
Processing triggers for ureadahead (0.100.0-16) ...
Processing triggers for man-db (2.6.7.1-1ubuntu1) ...
Processing triggers for install-info (5.2.0.dfsg.1-2) ...
Setting up libcgmanager0:amd64 (0.39-2ubuntu2~ubuntu14.04.1) ...
Setting up screen (4.2.1-2~ubuntu14.04.1) ...
update-rc.d: warning: default start runlevel arguments (2 3 4 5) do not match screen-cleanup Default-Start values (S)
update-rc.d: warning: default stop runlevel arguments (0 1 6) do not match screen-cleanup Default-Stop values (none)
Processing triggers for libc-bin (2.19-0ubuntu6.7) ...