IMessage on ML - "Could not sign into iMessage. Please check network settings and try again"

i came across an issue when signing into iMessage with an Apple ID on Mac.
i had been experiencing the "Could not sign into iMessage. Please check network setting and try again" error for iMessage issue since installing Mountain Lion. i finally solved my problem after talking to the Apple Tech Support team.
Here's the steps:
1. Shut down laptop.
2. Switch on laptop again. immediately hold down the left "SHIFT" key until u get into the log in screen. By doing this, ur laptop will be in "Safe Boot" mode.
3. Sign into iMessage using Apple ID. (i was able to sign into iMessage for the first time on my Mac since getting ML)
4. Shut down laptop again.
5. This time switch laptop on normally.
6. You should be able to use iMessage normally.
in addition, make sure the boxes for date & time and timezone are ticked to be set automatically.
Hope this is helpful for users experiencing the same issue i had. it did for me!
Cheers

Okay,
let me add my story to this thread.
Brand spanking MBA, Mountain Lion.......logged into Imessage 1st thing, no prob.
Then, after a few weeks; in the middle of a chat....the name of the other person turned red and my sent messages received a red dot as they were not sent. I checked with the other person.
I couldn`t recieive any messages either, not from any contact.
I logged out, and I couldn`t log in anymore.
I get a yellow triangle saying something like "error while logging in, try again later".
I tried again and again later........
I seeked help on this forum and a user helped me initially.
I re-installed the whole Mountain Lion, a process that I don`t care to repeat too often.
That fixed it for a while, but yesterday the same thing happened.
In the middle of a chat....the red name, the red dots......well, you get the picture.
I tried, to no avail:
# to log in after reseting the PRAM
# boot up and log in whilst in SAVE mode. It will NOT log in, same problem
# to log in after deleting all Imessages and Facetime files in Library/Preferences
# to log in with my wife`s Apple ID, or any ID really.
What did work was logging in with my ID on my wife`s Ipad, no worries.
My account is Yahoo, and don`t seem to be the problem.
Please, any suggestions welcome.
I have urged Apple politley to give us a fix at:
http://www.apple.com/feedback/
Thanks,
MXP 150 Patriot

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