Solution : https://service.sap.com/sap/support/notes/571241 (SAP Service marketplace login required)
Key words :
'logon group maintenance' window opens, import support package sapkb46c42, rfc-enabled' control box, prerequisites basis releases lower, basis releases lower, support package sapkb46d27, logon group names, sap basis release 4, symptom rfc users, large-scale problems
Related Notes :
| 593058 | New RFC load balancing procedure |
| 556212 | Downporting RFC Load balancing to lower releases |