Oracle : Ошибка ORA-06131

"NETTCP: user access denied"
*Cause: The host's SQL*Net TCP/IP server rejected this connection
request because the client user(name) does not have access
privilege - as determined by the contents of the Username
Mapping Table (UMT), a component of the host's CONFIG.ORA.
*Action: To grant access, add appropriate entry to the host's UMT.

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