Ubuntu (slave) & Raspberry pi 4 (master) not able to connect

edit

hello,

I got some weird behaviour,

I setup the master uri to my other machine, and run roscore with no issue

but on the slave I get this

WARNING: ROS_MASTER_URI **[http://192.168.1.55:11311]** host is not set to this machine

auto-starting new master

process[master]: started with pid [3579]

ROS_MASTER_URI=**http://ros:11311/** <-------how do I fix this ????

• I cannot list any service nor publisher from the master (but I can 'ping' and 'netcat 11311' it)

• I tried editing the hosts file so 'ros' would point to the master instead of 127.0.1.1, but then roscore failed to launch

any idea what's could be wrong?

thanks