I have a Moodle 2.6.2 running being the LTI provider (using the LTI Provider plugin).
My consumer Moodle is 2.6+ and there we use the External tool activity.
This works fine using Chrome and other browsers.
Using Internet Explorer 9, 10 and 11 it does not work. The link of the External Tool can be clicked and seems to start but ends up showing the login screen.
I have experimented with authentication 'No login' and 'Manual' but both do not work. Have deleted all LTI accounts and started from consumer again. I can see that an account is being created on the provider site so some communication is being done.
Anyone who has experienced the same and can provide a solution?