Late Update Date: 01/28/2026
The first step to ensuring that your students and teachers do not become frustrated by firewall issues is to have your IT department follow the whitelisting instructions below to allow our domains. Once the whitelisting is complete, please have your IT department to sign in with all normal filters active and verify that the web app is functioning in their environment.
After fully implementing the whitelisting instructions, please check that you and your students are using the most up-to-date version of Google Chrome as a browser. This works best with our platform. If this issue does not resolve once our domains are approved, please let us know so we can further investigate.
MasteryPrep Whitelisting Instructions
To ensure that students and teachers are able to access the program
successfully, please whitelist the following domains:
- app.masteryprep.com
- mp-ready-production.firebaseio.com
- us-central1-mp-ready-production.cloudfunctions.net
- mp-ready-production-default-rtdb.firebaseio.com
- mp-ready-production.uc.r.appspot.com
- mp-ready-production.appspot.com
- mp-ready-production.firebaseapp.com
- issuu.com
- firestore.googleapis.com
- storage.googleapis.com
- firebasestorage.googleapis.com
- stream.mux.com
- firebaselogging-pa.googleapis.com
- fcm.googleapis.com
- gcm-http.googleapis.com
- accounts.google.com
- e.issuu.com
- wistia.com
- mp-ready-production.appspot.com
- https://studyplan-7rqiftjmxq-uc.a.run.app/
- https://chromiumdash.appspot.com/
- *.masteryprep.com
- lb.masteryprep.com
- assessment.masteryprep.com
- www.masteryprep.com
- https://cdn.masteryprep.com
- mux.com
- edgemv.mux.com
- manifest-gcp-us-east4-vop1.fastly.mux.com (for Chromebooks)
-
chunk-gcp-us-east4-vop1.edgemv.mux.com (for Chromebooks)
Firebase Authentication and the Firebase Realtime Database both use HTTPS to
communicate between the client and the server. This means that all communication
goes over port 443. The database communication uses web sockets over port 443
when possible.
Important Note: We’ve received reports that image-blurring browser add-ons (such as Linewiz) can interfere with testing and cause resource loading issues. To avoid disruptions, please ensure these add-ons are disabled during testing sessions.