Knowledgebase: APDL
Error in Sign-In - ReadHeaders
Published 12 October 2017 03:49 PM (Article ID: 210)
If you get an error trying to login such as "Error in Sign-In There was an error during sign-in (Error getting response stream (ReadHeaders): ServerProtocolViolation)" most likely it's a simple networking issue on your device.

Go to your device's Settings > General > Reset and then tap Reset Network Settings

Retry the login. You may have to reboot/power cycle the device.
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