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Changes in Synchronization with PADS4 Version 2021.3

With the introduction of PADS4 version 2021.3, the synchronization mechanism between PADS4 Servers has been updated. This change may impact existing installations where PADS4 Sub and/or Backup Servers are in use.

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New Replication Mechanism in PADS4 Version 2021.3

In previous versions of PADS4, replication followed a one-way connection model, where the Sub/Backup Server initiated a connection to the Main Server for synchronization. Starting from PADS4 version 2021.3, the replication process has been enhanced. The Main Server and Sub/Backup Servers can now both initiate the connection, enabling a more flexible and resilient synchronization process. This update introduces a key networking requirement:
  • A host port must be opened in the firewall for communication between servers.
  • Both Main Servers and Sub/Backup Servers must be able to establish a bidirectional connection for replication to function correctly.

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Firewall Configuration Requirements

From PADS4 version 2021.3, replication between servers requires that:
  • The Main Server must be able to initiate a connection with the Sub/Backup Server.
  • The Sub/Backup Server must be able to initiate a connection with the Main Server.
  • The appropriate host ports must be opened in the firewall to allow traffic in both directions.
This differs from previous versions, where only the Sub/Backup Server was responsible for initiating the connection to the Main Server.

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Important Note

A full-duplex network connection is required between the Main Server and the Sub/Backup Servers. Both servers must be able to establish a direct connection with each other for proper replication and synchronization.
This new replication method ensures a more robust and efficient synchronization process, reducing potential disruptions in digital signage operations.