The update I got just now still doesn’t have the correct wildcard, it has:
ExecStart=/usr/bin/transmission-daemon -f --log-error --allowed ...
while it should be:
ExecStart=/usr/bin/transmission-daemon -f --log-error --allowed *.*.*.*
however as a work around for people who want to use whitelisting or turn it off, I would just create a custom script without the --allowed option as explained here:
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read the rest of the post if not clear.