Absolutely Not When you install Weblogic any Version Oracle Provide you with Command Line Utility to administrate weblogic, what you can do it using Console can be done with this tool.
change to weblogic-directory/common/bin
./wlst.sh
Now follow the below Steps to change port :
wls:/offline> readDomain (‘/u01/app/fmw/domains/IDDomains’)
wls:/offline/IDDomains> cd (‘Server’)
wls:/offline/IDDomains/Server> ls ()
Choose your Server Here
wls:/offline/IDDomains/Server> cd (‘AdminServer’)
wls:/offline/IDDomains/Server/AdminServer> ls ()
Search for Old Port ListenPort
wls:/offline/IDDomains/Server/AdminServer> set (‘ListenPort’,New Port)
wls:/offline/IDDomains/Server/AdminServer> updateDomain ()
wls:/offline/IDDomains/Server/AdminServer> exit ()
Done you can now Test your new port
http://Server-ip:/console
Thank you
Osama Mustafa