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The Mine and Apply processes have to communicate with each other for the replication to be successful. If this is not the case, then replication will be stopped. 

In the console this can sometimes be seen with the following error message:

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MINE IS running. Currently at plog 1071 and SCN 9832904 (06/10/2011 23:10:19).
Could not connect to APPLY process. Process not started or connection refused.

This section describes how to trouble shoot connectivity issues between the Mine and Apply processes.

Solution:

1. Check if the mine process is able to connect through the network to the apply process.

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dbvrep> show interface
MINE1.MINE_LISTEN_INTERFACE = 0.0.0.0:7903
*.MINE_REMOTE_INTERFACE = localhost:7890
APPLY.APPLY_LISTEN_INTERFACE = 0.0.0.0:7902
APPLY.APPLY_REMOTE_INTERFACE = xxx:7902
MINE.MINE_LISTEN_INTERFACE = 0.0.0.0:7901
APPLY1.APPLY_REMOTE_INTERFACE = xxx:7904
*.APPLY_REMOTE_INTERFACE = localhost:7891
APPLY1.APPLY_LISTEN_INTERFACE = 0.0.0.0:7904
*.FETCHER_REMOTE_INTERFACE = localhost:7889
*.MINE_LISTEN_INTERFACE = localhost:7890
MINE.MINE_REMOTE_INTERFACE = xxx:7901
*.APPLY_LISTEN_INTERFACE = localhost:7891
*.FETCHER_LISTEN_INTERFACE = localhost:7889
MINE1.MINE_REMOTE_INTERFACE = xxx.cr:7903

Please ensure all ports listed above are open on the specific servers. 

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