How do I check for connectivity between the RMAN target and RMAN catalog database?

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Assuming that TNS naming has already been setup, use tnsping to check that it is actually configured correctly. With some versions of Oracle, tns naming is particularly difficult to setup, and doesn't work as expected without manually modifications of the listener.ora and tnsnames.ora.

If tnsping can't ping both systems, from both systems (ie 4 tests), rman won't work properly.

--dg