The Ektron Windows Service for versions 9.3 and higher have made a switch to a secured connection by default. This change will lead to issues when older sites are on a CMS server that is running 9.3 or higher by default.
If there are issues syncing between two 9.3 sites there might something within the network blocking communications.
To get older versions of Ektron to sync between servers running 9.3 or higher the EnableNonSSLEndpoints field in the \Program Files (x86)\Ektron\EktronWindowsService40Ektron.ASM.EktronServices40.exe.config file will need to be set to true. Once changed stop and start the Ektron Windows Service and confirm that the service is shown as started in the event viewer. This will revert the sync to the pre-9.3 configurations, and will need to be implemented on all environments involved in a sync relationship.
If syncs between 9.3 sites are having trouble syncing there might be network settings that are blocking the communications. Setting the EnableNonSSLEndpoints to true as shown below can be used to help determine if the changes in sync standards is impacting the connection. If there is a change in behavior after switching this setting we recommend reviewing the network configuration for factors that might be impacting the sync communication.
<add key="EnableNonSSLEndpoints" value="true" />