Mac lost connection to my account iMessage

My mac lost connection to my iMessage account. All the names of my contacts are signed in red (and not in green as usual), and I can't send SMS.
Is there a reason that my mac is doing this? please help
MacBook Pro (15 inch, late 2011)
2,2 GHz Intel Core i7
4 GB 1333 MHz DDR3
Mac OS X Yosemite

Do a backup.
Quit the application.
Go to Finder and select your user/home folder. With that Finder window as the front window, either select Finder/View/Show View options or go command - J. When the View options opens, check ’Show Library Folder’. That should make your user library folder visible in your user/home folder. Select Library. Then go to Preferences/com.apple.iChat.plist. Move the .plist to your desktop.
Restart the computer, open the application and test. If it works okay, delete the plist from the desktop.
If the application is the same, return the .plist to where you got it from, overwriting the newer one.
Thanks to leonie for some information contained in this.

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Hello chlanli
You would need to use one Apple ID for purchases in order to get them across all of your devices and computer. If you want you can use one Apple ID for purchases and the other one to sync personal data. The article below will explain further.
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http://support.apple.com/kb/ht4895
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RDP 8.02438 for Mac lost connection when scroll on touchpad or mouse

Hello
when I scrolled pages in win apps by using touchpad or apple mouse rdp lost connection and error message appears: "connection reset by peer"
It appear not always but if I switch from one apps to anther in launchpad and tries to scroll at once in active window(not always but often). But if after switching to that app I press somewhere inside active window by mouse I can scroll (in that case scroll
always works correctly)
It seems that in RDP after switching to new app window it gets focus only after clicking inside active window.
It's difficult to me describe it exactly in english

[2014-Feb-18 17:18:42] RDP (0): Server hides cursor
[2014-Feb-18 17:18:42] RDP (0): Server hides cursor
[2014-Feb-18 17:18:42] RDP (0): Server hides cursor
[2014-Feb-18 17:18:42] RDP (0): Protocol state changed to: ProtocolDisconnecting(7)
[2014-Feb-18 17:18:42] RDP (0): Protocol state changed to: ProtocolDisconnected(8)
[2014-Feb-18 17:18:42] RDP (0): ------ END ACTIVE CONNECTION ------
[2014-Feb-19 10:44:12] RDP (0): Final rdp configuration used: screen mode id:i:2
use multimon:i:1
session bpp:i:24
full address:s:*****
audiomode:i:0
username:s:******
disable wallpaper:i:0
disable full window drag:i:0
disable menu anims:i:0
disable themes:i:0
alternate shell:s:
shell working directory:s:
authentication level:i:2
connect to console:i:0
gatewayusagemethod:i:0
disable cursor setting:i:0
allow font smoothing:i:1
allow desktop com:1
bookmarktype:i:3
use redirection server name:i:0
[2014-Feb-19 10:44:12] RDP (0): --- BEGIN INTERFACE LIST ---
[2014-Feb-19 10:44:12] RDP (0): lo0 af=18 addr= netmask=
[2014-Feb-19 10:44:12] RDP (0): lo0 af=30 (AF_INET6) addr=::1 netmask=ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff
[2014-Feb-19 10:44:12] RDP (0): lo0 af=2 (AF_INET) addr=127.0.0.1 netmask=255.0.0.0
[2014-Feb-19 10:44:12] RDP (0): lo0 af=30 (AF_INET6) addr=*** netmask=ffff:ffff:ffff:ffff::
[2014-Feb-19 10:44:12] RDP (0): gif0 af=18 addr= netmask=
[2014-Feb-19 10:44:12] RDP (0): stf0 af=18 addr= netmask=
[2014-Feb-19 10:44:12] RDP (0): en0 af=18 addr= netmask=
[2014-Feb-19 10:44:12] RDP (0): en0 af=30 (AF_INET6) addr=***** netmask=ffff:ffff:ffff:ffff::
[2014-Feb-19 10:44:12] RDP (0): en0 af=2 (AF_INET) addr=1***** netmask=255.255.255.0
[2014-Feb-19 10:44:12] RDP (0): en1 af=18 addr= netmask=
[2014-Feb-19 10:44:12] RDP (0): en2 af=18 addr= netmask=
[2014-Feb-19 10:44:12] RDP (0): bridge0 af=18 addr= netmask=
[2014-Feb-19 10:44:12] RDP (0): p2p0 af=18 addr= netmask=
[2014-Feb-19 10:44:12] RDP (0): vnic0 af=18 addr= netmask=
[2014-Feb-19 10:44:12] RDP (0): vnic0 af=2 (AF_INET) addr=***** netmask=255.255.255.0
[2014-Feb-19 10:44:12] RDP (0): vnic1 af=18 addr= netmask=
[2014-Feb-19 10:44:12] RDP (0): vnic1 af=2 (AF_INET) addr=****** netmask=255.255.255.0
[2014-Feb-19 10:44:12] RDP (0): --- END INTERFACE LIST ---
[2014-Feb-19 10:44:12] RDP (0): ----- BEGIN ACTIVE CONNECTION -----
[2014-Feb-19 10:44:12] RDP (0): client version: 8.0.24308
[2014-Feb-19 10:44:12] RDP (0): Protocol state changed to: ProtocolConnectingNetwork(1)
[2014-Feb-19 10:44:12] RDP (0): Resolved '****' to '****' using NameResolveMethod_DNS(1)
[2014-Feb-19 10:44:12] RDP (0): Protocol state changed to: ProtocolNegotiatingCredentials(2)
[2014-Feb-19 10:44:12] RDP (0): Exception caught: Exception in file '../../librdp/itotlayer.cpp' at line 847
User Message : Security negotiation Error: NotAllowed(2)
[2014-Feb-19 10:44:12] RDP (0): Protocol state changed to: ProtocolConnectingNetwork(1)
[2014-Feb-19 10:44:12] RDP (0): Resolved '****' to '****' using NameResolveMethod_DNS(1)
[2014-Feb-19 10:44:12] RDP (0): Protocol state changed to: ProtocolNegotiatingCredentials(2)
[2014-Feb-19 10:44:12] RDP (0): **** User ACCEPTED connection to basic security host
[2014-Feb-19 10:44:12] RDP (0): Protocol state changed to: ProtocolConnectingRDP(3)
[2014-Feb-19 10:44:12] RDP (0): Protocol state changed to: ProtocolInactive(4)
[2014-Feb-19 10:44:12] RDP (0): Protocol state changed to: ProtocolActive(5)
[2014-Feb-19 10:44:28] RDP (0): Server hides cursor
[2014-Feb-19 10:44:30] RDP (0): Server shows cursor
[2014-Feb-19 10:44:38] RDP (0): Protocol state changed to: ProtocolInactive(4)
[2014-Feb-19 10:44:38] RDP (0): Protocol state changed to: ProtocolActive(5)
[2014-Feb-19 10:56:55] RDP (0): Protocol state changed to: ProtocolDisconnecting(7)
[2014-Feb-19 10:56:55] RDP (0): Protocol state changed to: ProtocolDisconnected(8)
[2014-Feb-19 10:56:56] RDP (0): ------ END ACTIVE CONNECTION ------
[2014-Feb-19 10:57:55] RDP (0): *** Application terminated ***
[2014-Feb-19 11:49:35] RDP (0): *** Application terminated ***

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I have tried different USB ports and 2 different cables, that I used before for this. Re-started the computer several times. Paper is ok. Test page comes out fine. When I first got the printer, my computor found it by itself. And it worked excellent until I disconnected it over the weekend.
I hope someone recognize this problem and can help me out?
Thanks, M

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