ORA-30700
network connection failed: destination unreachable
Cause
The network connection attempt did not succeed. This form of error typically indicated that the target network host address was misspecified, that there was a network connectivity or routing problem, or that the request needed to be routed through a proxy.
Action
Ensure that the network target is correctly specified, that there isn't a network connectivity or firewall problem, and that a proxy is being used if required, then retry the operation.