Unable to establish session with IdP using Edge

[Peter Schober]

* Zacharyzachary Pearson <zpearson at hawk.iit.edu> [2018-02-23 18:58]:
> I am using a shibboleth IdP and am able to authenticate and
> successfully establish a session with most other browsers I’ve been
> testing, but in Edge I run into this error after authenticating
> 
> SCRIPT7002: XMLHttpRequest: Network Error 0x2efd, Could not complete
> the operation due to error 00002efd.

What kind of script would be doing an XMLHttpRequest here?
Sounds like someting you must have added.

-peter