How to disable character transfer on your own server

[Narelle]

This is wrong. You need to set the setting to false:

PC Update 2.5 Discussion Megathread

For Private Server owners; it looks like ServerTransferEnabled is set to True by default. This was not intended, but is currently out there. If that’s not what you want, then we recommend server admins go to their server configs and set that variable to False and restart your servers. Some of you probably noticed by now, but we apologize for any confusion or inconvenience this caused.

ServerTransferEnabled=false