IAS error - REP-56040: Server rep_ already exists in the network

If you encounter these error "REP-56040: Server rep_ already exists in the network", then there's a possiblity that the report services detected the same services name in other server. To find out if it can detect other report services , run below command.

In MS Windows: %ORACLE_HOME%\bin\rwdiag.bat -findall
In Unix: $ORACLE_HOME/bin/rwdiag.sh -findAll

Broadcast mechanism used to locate servers------------------------------------------
Channel address = 228.4.6.6 Channel port = 14021
(1) Name = : Type = server : Host = .oracle.com
(2) Name = : Type = server : Host = .oracle.com
(3) Name = : Type = server : Host = .oracle.com
(4) Name = : Type = server : Host = .oracle.com

notice, that the report server services appear on the different hostname. In the rwservlet.trc,
Exception 51002 (): Bind to Reports Server failed.

There's two way to resolve this , 1 way is to set different report_server name compare with other server or 2 , changing the naming method in the $ORACLE_HOME/reports/rwnetwork.conf

Uncoment the multicast and enabled the naming method. e.g.

multicast channel="228.5.6.7" port="14021" timeout="1000" retry="3"/
!--namingService name="Cos" host="%NAMING_HOST%" port="%NAMING_PORT%"/--

to

discoveryService

!-- multicast channel="228.5.6.7" port="14021" timeout="1000" retry="3"/--
namingService name="Cos" host="testserver" port="14021"
/discoveryService


Metalink note:
- Intermittent REP-51002 or REP-56040 and Same Repserver is Displayed Multiple Times in Rwdiag.sh Output, Note ID :563367.1
-REP-51002 And Rep-56040 if More than one OC4J_BI_FORMS Instance is Created, Note ID : 390412.1