Oracle : Ошибка ORA-06321

"IPA: Cannot reach the remote side"
*Cause: There has been a timeout on an attempt to connect to a remote
server the reason for which is most likely to be the remote
SQL*Net IPA software is not running. An alternative reason
could be that the remote initiator service name is incorrect.
*Action: Check and start the remote SQL*Net software. Check that it is
started with the correct service names supplied.

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