Azure PowerShell Login: browser based authentication dialog failed to complete

Question

I'm getting this error when running Login-AzureRmAccount in PowerShell:

Login-AzureRmAccount : The browser based authentication dialog failed to complete. Reason: The request could not be 
processed by the server due to invalid syntax.
At line:1 char:1
+ Login-AzureRmAccount
+ ~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Add-AzureRmAccount], AadAuthenticationFailedException
    + FullyQualifiedErrorId : Microsoft.Azure.Common.Authentication.AadAuthenticationFailedException,Microsoft.Azure.Comm 
   ands.Profile.AddAzureRMAccountCommand

I see the login window pop up briefly, but it closes immediately and this error message displays.

Solution

It turned out my proxy settings were preventing me from connecting to the internet. Once I corrected my proxy settings I was able to log into Azure as expected. Not sure what the "invalid syntax" error is all about...

Comments

[BobbyA]

Can you comment on what was wrong with your proxy settings?

[BenV]

@BobbyA I can't remember for sure; most likely I had it disabled when I was at work or enabled when I was at home.