2399283 - Error "The markup in the document following the root element must be well-formed" occurs in step "Maintain Users" - SAP Solution Manager

• The following errors occur in step "Maintain Users" for SAPSUPPORT and SM_COLL*:

• "Existence of user SAPSUPPORT on system <JAVA system SID> could not be checked."
• "An error occured while processing the UME command READ_USER from agent <hostname>: The markup in the document following the root element must be well-formed. : The markup in the document following the root element must be well-forme d." 

• Anoher symptom may be that the error message appears in the CCDB Administration for JAVA systems having enabled SPML stores

"Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental"

SAP Solution Manager 7.2

Create New User, Update User Roles, Enter System Parameters, Maintain Users, SM_COLL, The markup in the document following the root element must be well-formed , KBA , SV-SMG-INS-CFG-MNG , Managed System Configuration , SV-SMG-DIA , Diagnostics , Problem