Unable to Login. Invalid Connection to Login Service

What does this mean?

This error means that something is blocking Measure from communicating with RFMS' license server. This is usually due to security software throwing a false-positive.

What can I do?

Create an exception in your security software for "http://measurelogin.trafficmanager.net/api/" and "http://measurecloudlogin.cloudapp.net/" as well as for the Measure executable file, "msr6.exe".