Hi,
I agree with Farid.
Additional information
The external LDAP can then be defined in MWS under Directory Services.
Users of this Directory Service can be added to Roles which in turn can be added to ACLs in IS if users present in the LDAP should to be able to login to IS.
Additionally it might be worth to check the CommandCentral/SPM configuration if they require a LDAP connectivity too. As they have their own User Management Subsystem the LDAP connectivity needs to be configured separately to the one for MWS/IS.
BTW:
In which log file were the messages encountered?
IS server.log or SPM log?
Regards,
Holger