okay, I wait and hope that it will work. It is now running for around 6 hours and still 00:00 Active since...
but just one question more:

in the config under port. do I put 48744?

rpcallowip=127.0.0.1
rpcuser=REPLACEME
rpcpassword=REPLACEME
staking=0
server=1
listen=1
port=REPLACEMEWITHYOURPORT
masternode=1
masternodeaddr=149.172.53.145:48744
masternodeprivkey=5npgAoFY9Pcf43B23JUQ31Vw495JX3vTCpGLsXymxMxtZm4XWFS