Gmail doesn't work

Gmail doesn’t work after having upgraded.
What to do?

I have the same problem.

It might be because something is blocking the connection. What is the error?

As a test, can you completely disable any anti-virus, firewall, proxy or VPN, then try again.
Sometimes even restarting your router may resolve this.

But it may also be of the changes that have taken place at Google in the past few days. Please see: Google ‘less secure apps’ access and what it means for eM Client | eM Client