Status 26 "client/server handshaking failed" during disk staging

Hi !

I have some duplications which fails with status 26. In fact, the DSSU policies fails, but the duplication jobs associated end with status 0. Any idea , Where can I search first ?

My master and media are in Windows 2K8 with 7.6.0.2 version.

08/09/2015 04:00:00 - Info nbjm(pid=4640) starting backup job (jobid=981620) for client vsaus113.proton.intra.irsn.fr, policy __DSSU_POLICY_Storage_Unit_Vsaus113_Lun9, schedule Storage_Unit_Vsaus113_Lun9 
08/09/2015 04:00:00 - Info nbjm(pid=4640) requesting NO_STORAGE_UNIT resources from RB for backup job (jobid=981620, request id:{8536E5B8-FC1C-4DC0-B821-760489DD1F40}) 
08/09/2015 04:00:00 - requesting resource asaus111v.proton.intra.irsn.fr.NBU_CLIENT.MAXJOBS.vsaus113.proton.intra.irsn.fr
08/09/2015 04:00:00 - requesting resource asaus111v.proton.intra.irsn.fr.NBU_POLICY.MAXJOBS.__DSSU_POLICY_Storage_Unit_Vsaus113_Lun9
08/09/2015 04:00:01 - granted resource asaus111v.proton.intra.irsn.fr.NBU_CLIENT.MAXJOBS.vsaus113.proton.intra.irsn.fr
08/09/2015 04:00:01 - granted resource asaus111v.proton.intra.irsn.fr.NBU_POLICY.MAXJOBS.__DSSU_POLICY_Storage_Unit_Vsaus113_Lun9
08/09/2015 04:00:09 - estimated 0 Kbytes needed
08/09/2015 04:00:09 - begin Parent Job
08/09/2015 04:00:09 - begin Disk Staging, Start Notify Script
08/09/2015 04:00:10 - Info RUNCMD(pid=6136) started           
08/09/2015 04:00:10 - Info RUNCMD(pid=6136) exiting with status: 0        
Status 0
08/09/2015 04:00:10 - end Disk Staging, Start Notify Script; elapsed time: 0:00:01
08/09/2015 04:00:10 - begin Disk Staging, Execute Script
08/09/2015 04:00:11 - started process bpbrm (18656)
Status 26
08/09/2015 06:00:22 - end Disk Staging, Execute Script; elapsed time: 2:00:12
08/09/2015 06:00:22 - begin Disk Staging, Stop On Error
Status 0
08/09/2015 06:00:22 - end Disk Staging, Stop On Error; elapsed time: 0:00:00
08/09/2015 06:00:22 - begin Disk Staging, End Notify Script
08/09/2015 06:00:22 - Info RUNCMD(pid=21240) started           
08/09/2015 06:00:22 - Info RUNCMD(pid=21240) exiting with status: 0        
Status 0
08/09/2015 06:00:22 - end Disk Staging, End Notify Script; elapsed time: 0:00:00
Status 26
08/09/2015 06:00:22 - end Parent Job; elapsed time: 2:00:13
client/server handshaking failed(26)

Thanks