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Please check the time settings of the client server and the Alfresco server. The client server's timestamp should not have a lag of 5 minutes or more from Alfresco server's timestamp.
<parameter name="timeToLive" value="900"/>
<parameter name="timestampStrict" value="false"/>
I think that you need to change the time settings of the operating system of the Alfresco Server and your custom application that invoke Alfresco externally.Hope this helps.