If the concurrent manager is not starting then we need to go and check the Concurrent manager log.

If the error is:
Routine AFPGCP cannot create a process ID for your concurrent manager process ORACLE error 8004 in FDUUID
Cause: FDUUID failed due to ORA-08004: sequence FND_CONCURRENT_PROCESSES_S.NEXTVAL exceeds MAXVALUE and cannot be instantiated.
TheCall to establish_icm failed
The Internal Concurrent Manager has encountered an error.


Reason:

The max value for the sequence FND_CONCURRENT_PROCESSES_S has been reached and we need to increase the max value.

SQL> select FND_CONCURRENT_PROCESSES_S.nextval from dual;
select FND_CONCURRENT_PROCESSES_S.nextval from dual
*
ERROR at line 1:
ORA-08004: sequence FND_CONCURRENT_PROCESSES_S.NEXTVAL exceeds MAXVALUE and
cannot be instantiated


Solution

SQL> select * from dba_sequences where sequence_name = 'FND_CONCURRENT_PROCESSES_S' ;

SEQUENCE_OWNER SEQUENCE_NAME MIN_VALUE MAX_VALUE INCREMENT_BY C O CACHE_SIZE LAST_NUMBER
—————————— —————————— ———- ———- ———— – - ———- ———–
APPLSYS FND_CONCURRENT_PROCESSES_S 1 9999999 67778 N N 1000 10048596

Solution:

Increase max value;(should be greater than previous Max value)

SQL> ALTER SEQUENCE APPLSYS.FND_CONCURRENT_PROCESSES_S MAXVALUE 99999999;

Sequence altered.