Esri Maps for SharePoint: Invalid redirect_uri

[BudurR]

Hello,

I have installed Esri Maps for SharePoint and configured every thing. It was working before 2 weeks.

Now when I enter the page it ask me to login (Click here to sign in to ArcGIS.) and then I got following error:

Error

Invalid redirect_uri

Error: 400

How to slove this? I need your help please. 

Attached (Configuration Settings) page

[BudurR]

It was a weird solution!!! I clicked on the login link like 100 times and suddenly it worked!!! I don't know how and why!!!!