TNS-12527: TNS:listener: all instances are in restricted
mode or blocking new connections
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Answer / guest
Cause: All appropriate database instances supporting the
service requested by the client reported that they either
were in restricted mode or were blocking the new
connections. The Listener does not allow connections to such
instances. This condition may be temporary, such as at
instance startup.
Action: Attempt the connection again. If error persists,
then contact the database administrator to check the status
of the instances.
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