2326014 - Error: A3WESCRR 168 Cannot get work process info from server" during RUN_RSCPFROM_CRR phase of Software Update Manager

During the upgrade of SAP NetWeaver 7.x system, the following error occurs during phase RUN_RSCPFROM_CRR:

<< 2016/06/03 15:56:23 END OF PHASE MAIN_NEWBAS/RUN_RSCPFROM_CRR
=========== Repeat Phase ===========

Checks after phase MAIN_NEWBAS/RUN_RSCPFROM_CRR were negative!

Last error code set: Single errors (code <= 8) found in logfile 'RSCPFROMDT.ELG'

*ERROR* :
Batchjob RSCPFROM_CRR failed.
Detected the following errors:

# <SUM directory>/abap/log/RSCPFROM_CRR_DT.SID:
A3WESCRR 168 Cannot get work process info from server "hostname_SID_00". RC: "1"
A3WESCRR 168 Cannot get work process info from server "hostname_SID_00". RC: "1"
A3WESCRR 168 Cannot get work process info from server "hostname_SID_00". RC: "1"
A4 ESCRR 172 All WP's on Server:
A4 ESCRR 170 Free Batch WP's: "2-". See List:
A2EESCRR 056 Transition "CPFROMDT" failed for scenario "CPFROMEHP"
A2EESCRR 096 At least 3 batch slots are needed for execution.

• SAP NetWeaver 7.x

KBA , BC-UPG-TLS-TLA , Upgrade tools for ABAP , Problem