Not able to login using Apple ID I am trying to login with Apple ID. But it shows an error like in the image. I used to login with a browser and it's working. Also I couldn't update my apps in my Mac. Please help. Not only now... it always shows like this.
I just had the same problem. Here's how I solved it:


Sign out from your Account
Just try to download something from iTunes / AppStore
iTunes will promt you to sign in
Enter your credentials for your account


You're done. Worked for me. I hope it works for you.