Cannot use iCloud, app store, safari, iTunes

[charlielqy]

I have some problems with iCloud, safari, app store and iTunes after upgrading to Sierra.
iCloud: cannot connect to the server.
safari: I can open the safari but cannot browse any website, it always blank page, but I can use chrome to browse any pages.
app store: I can open the app store but there is noting on it, looks like cannot connect to the server.
iTunes: i can open the iTunes but there is nothing on it. It will crash after 1 minute. I have download the newest version from apple website but still not working.

Anyone know what happened?

 

[blindpcguy]

weird app store is having issues on my end but not those it won't download apps or updates on my end and trying to download sierra to update past the gm keeps failing as well hope you get the issues your having resolved as its a great OS
[doublepost=1474505662][/doublepost]oh and welcome to the forums btw its a great place to hang outing discuss all things apple.