How to change the default vncserver port number of the remote Ubuntu 22.04 desktop to avoid blocking by ISP

settings
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# vim ~/.vnc/xstartup
put this:

#!/bin/bash
PATH=/usr/bin:/usr/sbin
unset SESSION_MANAGER
unset DBUS_SESSION_BUS_ADDRESS
exec /usr/bin/gnome-session
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#vim /etc/systemd/system/vncserver@.service

put this:
[Service]
Type=forking
User=client
Group=client
WorkingDirectory=/home/client

ExecStart=/usr/bin/vncserver -localhost no :%i
ExecStop=/usr/bin/vncserver -kill :%i

[Install]
WantedBy=multi-user.target

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