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I am trying to create a new 21c (21.3) database on Linux 8.4 where I get to specifying the LISTENER I get a message that port 1521 is busy. Why would this happen and how do I get past this step? I only have WiFi connectivity to the Linux box
You can use netstat or fuser to check who is using port 1521 or simply choose a different port. SY.
for netstat -an | grep 1521 | grep -i listen I get nothing