See the announcement below from Qualtrics to ensure uninterrupted service:

At Qualtrics, we are committed to providing our customers with best-in-class security. As part of this commitment, we are currently transitioning our systems to HTTPS.

This security transition will prevent your users from accessing Qualtrics via URLs that including ‘”www”. Ongoing, all access to Qualtrics will require a secure URL that incorporates HTTPS.  Your current branded URL osu.qualtrics.com will continue to work as intended. However, if your user tries to enter Qualtrics via www.osu.qualtrics.com, they will receive an error message.

The security update will occur on June 12, 2017.