/usr/lib/x86_64-linux-gnu/libcppnetlib-client-connections.so.0 is in libcppnetlib0 0.11.2+dfsg1-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libcppnetlib-client-connections.so.0.11.2