Try restarting your device as your first measure.
I went to sign in to my Apple ID, so I could start downloading apps. I put in my email and password and then it said "Could not connect to server". I checked my WiFi then tried again,same issue. Changed to a different WiFi, same issue.
3 replies
I've tried that multiple times
In that case, I would contact Apple Support directly. I know it's not a 'solution' per-se, but they can help you better with that particular issue than I could: Get started
I can't sign in to my Apple Id