the issue: when trying to start the dac server (startserver.sh) you get:

fix it: you probably forgot to change the settings in the dac client. you don’t need the dac server running in order to make the following changes in the dac client:

Tools -> DAC Server Management -> Repository Configuration -> Select standalone mode -> Set the host & port

on the dac server:

execute StandaloneServersetup.sh in DAC Server and set the correct information (if you haven’t don so already)
shutdown and restart the dac Server (startserver.sh) — it should start fine now