ORA-30678

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ORA-30678: Too many open connections.

[edit] What causes this error?

A connection to a remote service failed because your Oracle session already opened too may other connections.

For example, a UTL_SMTP.OPEN_CONNECTION() to a mail service may result in this error if the connection is not properly closed (UTL_SMTP.QUIT).

[edit] How to fix it

Reconnect to or retry after closing some of the connections.