After Upgrade iOS from 13.XX to 14.XX l2tp over IPSec Connection stop working.
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I too am having this issues. When I try to connect from my phone, the LiveLog always shows that it’s connecting as the first user is the list. I’m not sure how to tell if this is a bug with the iOS not sending the username or if the UTM isn’t reading the username submitted. Perhaps it’s time for some packet sniffing.