Spotlight client error: "Connection lost to server on the specified host" (4219725)

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Spotlight client error: "Connection lost to server on the specified host"
Description

Spotlight clients randomly losing connection to diagnostic servers with the following error:
"Connection lost to server on the specified host"
This is a large-scale federated environment. Restarting the Diagnostic Server resolves the issue, however, issue reappears after a few days.
Resolution

Reduce the interval of the keep-alive job (currently every 10 sec). Apply below steps to change the default settings of each Diagnostic Server and remove content of Caches folder:
1. Open the CommunicationsService.xml file under Diagnostic Server installation folder: C:\Program Files\Quest Software\Diagnostic Server\Agent\conf\Service with Notepad
2. Change the value of property "keepaliveseconds" from 10 seconds to 60 like below:
<property name="keepAliveSeconds" dataType="STRING" displayName="Keep Alive Seconds" description="The number of seconds between keep alive messages"
encryptStyle="NONE" hidden="true">60</property>
3. Save and close the CommunicationsService.xml file
4. Go to C:\Program Files\Quest Software\Diagnostic Server\Agent\data\ directory and remove the entire "caches" folder
5. Restart the Diagnostic Server services

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