Oracle A423961 - Manual (Page 169)

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E – 25 Messages and Codes
ORA–06141: NETTCP: no privilege for user
A proxy login connect attempt failed because the SQL*Net TCP/IP server had
insufficient privileges to access the proxy account.
Change the account protection, change the server privileges, or both.
ORA–06142: NETTCP: error getting user information
A proxy login connect attempt failed because the SQL*Net TCP/IP server was
unable to access the proxy account.
Check the log file for the operating system–specific error code. Contact your
Oracle Customer Support representative.
ORA–06143: NETTCP: maximum connections exceeded
The connect failed because the number of concurrent connections has exceeded
the maximum supported by the host’s SQL*Net TCP/IP server.
Wait for a short period and retry the operation.
ORA–06144: NETTCP: SID (database) is unavailable
The database administrator on the host has taken the database to which you are
requesting access offline.