This article relates to our Simple Sign-On (SSO) product, but may also help solve a problem in other SSO systems. 

Situation: A user attempts to SSO into Office 356 and they're presented with a blank white page and are unable to progress any further. 

This problem is common associated with certain web-filters and we've found is particularly common with the Lightspeed web-filter. But fret ye not, there's an easy fix.

The issue is that the web-filter is blocking the browser from resolving

You can understand why - it does look like a suspicious address at first glance.  and Lightspeed started categorizing this Microsoft address as malware. But as you can see in this post of URLs and IPs it is a legit address: 

To solve this you can simply change forwarders in Lightspeed to 

If you have any questions or need any help please feel free to contact