Activation gets error: ORA-12526: TNS:listener: all appropriate instances are in restricted mode. (4304825)

During the setup of a new replication you follow the Administrators Guide: "Synchronizing data using an Oracle hot backup on a quiet database".
In Step 10 you activate the config on the source and get this error message:
06/26/07 12:03 Logging user command: oracle activate config filename
06/26/07 12:03 Process launched: sp_tconf (for o.ORA10g) [pid = 24215]
06/26/07 12:03 Notice: Oracle env - ORA10g:/ora_home/app/oracle/product/10.2.0 [sp_tconf(pdb)/24215]
06/26/07 12:03 Error: 12032 - OCIServerAttach failed with ORA-12526. [sp_tconf(osp)/24215]
06/26/07 12:03 Bad config file: file - unknown; Oracle Error: connect failed for database o.ORA10g - ORA-12526: TNS:listener: all appropriate instances are in restricted.
06/26/07 12:03 Process exited sp_tconf  (for o.ORA10g) [pid = 24215] - exit(1)