After digging a bit more in the Problem, it seems the default behavior of netcat changed: https://github.com/openbsd/src/commit/63825867a53e7b7dfcb2eba8ae4e14a838a685f5#diff-54d17f8e163e47a28589e2bf1ae5e4ce This means that all scripts and code which uses netcat have to been changed with this...