main : oracle.apps.fnd.isg.mgmt.client.AdminServiceProxy.getNextAppServer : Error: java.lang.SecurityException: User: ISGADMIN~~DBNAME, failed to be authenticated

 We got below error in Oracle Apps R12.2.9 when configuring  Integrated SOA Gateway Setup for REST Services.

main : oracle.apps.fnd.isg.mgmt.client.AdminServiceProxy.getNextAppServer : Error: java.lang.SecurityException: User: ISGADMIN~~DBNAME, failed to be authenticated

This error was gettin populated in log 

$JAVA_TOP/oracle/apps/fnd/isg/ant/ISGD_<>.log

Resolution

Changed the profile option "SignOn Password Custom" to NULL . Changed the ISGADMIN password from frontend (via sysadmin). Can use FNDCPASS also.

The password was retreived using below command:

select fnd_vault.get('ISG','ISGADMIN') from dual;

Later the profile was reverted.

SOA web services can be validated using following link-

http://<ebs-url>/webservices/rest/provider/isActive/