Could not sign in. Please check your network connection and try again

I had the same problem and tried @kempospa advice and it still didnt work but this did: go to general then reset then reset Network settings then connect to your wifi then reset to automatic date and time. I then went into iMessage under settings and was signed in but I had to sign into FaceTime.

Oreo1325 thank you after 6 hours found this worked for me :)

Thank you, this fixed the problem on my wife’s iPhone 🙂 We’d just been abroad and changed the time zone manually, and when we came back home again iMessage stopped working. Very bizarre that this solution works.

worked ,thank you

I had this problem on my iMac - FaceTime kept asking me to sign in and then wouldn't work and told me to check network etc. This happened several times and yet FaceTime was working fine on my iPad.

I tried turning off my Mac and when I turned it back on and went to FaceTime, signed in and magic it all worked again no problem.

It was that simple for me so worth a try!

Having same issue but on a Macbook Air os10.9.5. Any suggestions?

I Have No idea what to do I did the reboot and back up thing but it still hasn't worked

I Have the exact same problem, had to restore my fone from iCloud and haven't been able to get into my FaceTime or imsg Since last night!! If you figure anything else please let me know!!;(

OMG!! After 3 days of trying again and again I did it again just not and it worked, THANK YOU!!

(A1 having this problem id suggest to do this a few times and then if it doesn't work wait an hour or two and so it again. I tried everything of the suggestions and this is the only one that worked.)

I had the same problem after upgrading and fixed it by resetting my network settings. If you go to settings>general>reset>reset network settings, and reset,it might work! You'll have to re-enter your wifi passwords though.

I had this exact same problem on my mac - restarting didn't help and neither did a couple of other forums. I finally found the fix and it was totally illogical - open date and time preferences by clicking on the clock in the top right of the screen, then check the box 'set date and time automatically:" After that, sign back i by going to messages > preferences > account > imessage sign in. Worked immediately after!

Here's a fix that worked for me;

- make sure timezone is correct on router

- delete ~/Library/Preferences/com.apple.ids.service.com.apple.madrid.plist

- force quit iMessages

- switch off router

- switch off mac

- switch on router

- switch on mac

- sign into iMessages

Check your date and time settings and also time zone, these all need to be correct for the iMessage top work.

Peace.

I didn't have problem with iMessage, I faced this issue only in Facetime. I resolved it by setting the time automatically and it worked fine again.

I didn't have to reboot, I only close Facetime before the change then I open it again after the time was automatically set.

I just restarted my phone.

hope this helps