Network Requirements for Time Sync in Android Devices
Summary
Related SOTI ONE Platform Products
Related Device OS
Issue Description
Android devices with OS automatic time settings turned on cannot sync to an accurate time despite being connected.
Environment
- All SOTI MobiControl versions.
- Restrictive Wi-Fi or VPN Connections.
Symptoms
Device time is incorrect even with the automatic time synchronization and automatic clock set enabled in the OS.
Prevention
To prevent this issue, remove restrictions from the network time synchronization servers and ports for the Android devices.
Cause
Restrictive network settings can block devices from syncing with time servers. Specifically, Android devices need access to the time servers and UDP port 123. If blocked, device time auto-syncing is prevented when configuring time sync using NTS.
Issue Resolution
For automatic time on Android devices, whitelist time.android.com and UDP port 123 on firewalls. Devices need to communicate with time servers for time synchronization.
Additional Information
Time Overview Android documentation:
https://source.android.com/docs/core/connect/time
Network Time Detection Android documentation:
https://source.android.com/docs/core/connect/time/network-time-detection
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