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https://support.signal.org/hc/en-us
https://support.signal.org/hc/en-us/articles/360007320211-MMS-Troubleshooting
https://github.com/signalapp/Signal-Android/issues/6237
https://github.com/guardianproject/haven/issues/72
https://stackoverflow.com/questions/28807125/django-log-user-ip-for-user-login-failed-signal
https://www.telegraph.co.uk/news/2018/08/04/signal-failure-delays-could-become-complaint-past-train-company/
https://www.theguardian.com/notesandqueries/query/0,,-201845,00.html
https://meine.signal-iduna.de/
https://books.google.de/books?id=JkOXCgAAQBAJ&pg=PA9&lpg=PA9&dq=signal+login+failed
https://support.reolink.com/hc/en-us/articles/360007008113-WiFi-Connection-Keeps-Droping-on-Reolink-Cameras
https://www.cnbc.com/2018/05/14/facebook-just-entered-a-death-cross-which-could-signal-a-failed-rally.html
https://www.bbc.co.uk/news/business-41708585
https://www.bbc.co.uk/news/av/business-41970331/signal-failure-the-train-traveller-s-nightmare-explained