source and target database on the same linux server

I'm setting up replication from a 12.1 oracle database to a 12.1 oracle database using SP 8.6.6.  Both databases are on the same linux server.  I set up the source and started cop via

sp_cop -ukmsd02_2101 &


Then I setup up the target and tried to start cop.  I got this error:  Cop: Address already in use tcp server bind addr port 19576 - exiting  [module cop].

Cop was running when I set up the target.  Is that the problem?  What are the special considerations when replicating on the same server?




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