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A remote server object container (SOC) previously added to the host machine is no longer listed after the ArcGIS Server server object manager (SOM) restarts.
If a previously added SOC host is no longer valid when ArcGIS Server on a SOM machine restarts, it drops from the SOC host machines list. However, the host machines' information records in the Server.dat file, which is located in the '$AGSHOME/server/system' directory under the ServerMachines parameter. The SOC host is re-added to the SOC host machine list if it becomes available again when the ArcGIS Server SOM restarts. This is a known behavior.
$AGSHOME refers to the ArcGIS Server installation directory.
An SOC previously added as a host machine may become invalid due to several reasons. Below are tips for troubleshooting such cases:
The primary SOM refers to the SOM where the Identity Server used by a SOC is running.