Scheduled backups using the "backup_export" utility in TDV may fail intermittently with the following error: 

Error:

com.compositesw.cdms.webapi.WebapiException: User Session has expired.  Please re-authenticate.
        at com.compositesw.cdms.webapi.WebapiException_SOAPSerializer.doDeserialize(WebapiException_SOAPSerializer.java:58)
        at com.sun.xml.rpc.encoding.ObjectSerializerBase.deserialize(ObjectSerializerBase.java:209)
        at com.sun.xml.rpc.encoding.ReferenceableSerializerImpl.deserialize(ReferenceableSerializerImpl.java:172)
        at com.compositesw.cdms.webapi.service.WMetaDataSvc_archive_close_Fault_SOAPSerializer.deserializeDetail(WMetaDataSvc_archive_close_Fault_SOAPSerializer.java:54)
        at com.sun.xml.rpc.encoding.SOAPFaultInfoSerializer.doDeserialize(SOAPFaultInfoSerializer.java:151)
        at com.sun.xml.rpc.encoding.ObjectSerializerBase.deserialize(ObjectSerializerBase.java:209)
        at com.sun.xml.rpc.encoding.ReferenceableSerializerImpl.deserialize(ReferenceableSerializerImpl.java:172)
        at com.compositesw.cdms.webapi.service.WMetaDataSvc_Stub._readBodyFaultElement(WMetaDataSvc_Stub.java:24505)
        at com.sun.xml.rpc.client.StreamingSender._send(StreamingSender.java:238)
        at com.compositesw.cdms.webapi.service.WMetaDataSvc_Stub.archive_close(WMetaDataSvc_Stub.java:2208)
        at com.compositesw.cdms.webapi.WArchive.close(WArchive.java:80)
        at com.compositesw.cmdline.archive.BackupCommand.downloadArchive(BackupCommand.java:310)
        at com.compositesw.cmdline.archive.BackupCommand.startCommand(BackupCommand.java:98)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at com.compositesw.base.boot.ArchiveBoot.main(ArchiveBoot.java:59)

To resolve this issue, set the "Session Timeout" value to 0.

Here are the steps to update this parameter in TDV Studio:

1. Login to the TDV Studio with administrator credentials

2. Navigate to "Administration > Configuration > Server > Runtime Processing Information > Sessions > Session Timeout"

3. Change the value of "Session Timeout" to 0 seconds.