The server encountered an error processing registration. Please try again later.

Same here...it was something I did not see initially when I compared my file to what toddwest24 suggested. In my case it was a missing space:

255.255.255.255broadcasthost (mine) vs.

255.255.255.255 broadcasthost

Of note, when I added the space, the rest of the text tabbed over, so maybe there was an added tab, or a line break as noted above, that wasn't showing up. In any case, once I added the space it worked for me for messages. I'm old so I don't use facetime (bitnet, anyone?) so can't comment on that.

i do not have that (host thing) no where in my finder ! 😟 i also typed in the etc thing and it didnt pop up

I'm just dropping a comment here to provide my own solution to this issue. I tried most of the suggestions in this thread: restarting, firewall, checking my clock, re-formatting my hosts file. What finally worked for me was replacing my verisign root certificates. I was noticing other issues with some sites, like twitter, where I was getting a 'NET::ERR_CERT_AUTHORITY_INVALID' error from Chrome. That error indicated a problem with the certificates on my machine, which appeared to be correct.

The Chrome thread at https://productforums.google.com/forum/?utm_medium=email&utm_source=ba_notificat ion#!topicsearchin/chrome/NET$3A$3AERR_C… pointed out how to correct the issue for digicert, but not verisign. Some searching led me to the page at http://www.symantec.com/page.jsp?id=roots, which has a zipfile containing all of verisign's certs. I imported every .crt and .pem contained in the master zip file (http://www.symantec.com/content/en/us/enterprise/verisign/roots/roots.zip), then quit and restarted chrome, which fixed my problem. Turning my attention back to solving my iMessage problem, I noticed that a rendering/SSL issue with discussions.apple.com had suddenly cleared up! Excitedly, I restarted Messages.app and tried to re-authenticate to iMessage -- Success!!

If you're having any similar issues with SSL-enabled sites, it might be worth your while to delete/re-import your verisign certs to see if it solves your issue with Messages.app.

Cheers,

Kevin

I think they've fixed the problem. Now FaceTime works on 10.7.5.

So i tried this method, did not work. i replace the old file and then i looked at the text and put it side by side with the new one, They were both the same. So now i am stuck