How to force Oracle Weblogic to use IPv4(or IPv6) address
If you are running into issues starting up Weblogic with or without Administration port on and getting the following error, it could be due to trying to bind to IPv6 IP. Follow this tip to force Weblogic to bind to IPv4 instead.

<Error> <Server> <BEA-002606> <Unable to create a server socket for listening on channel "Default[5]". The address fe80:0:0:0:213:97ff:fe2
1:10d5 might be incorrect or another process is using port 6600: java.net.SocketException: Invalid argument