Shoot myself in the knee:
I disabled ether4 on a RB450G which is the masterport
of ether5. I no longer reach the RB450G via ether5.
No MAC-Telnet/Ping work.
Any Idea?
It’s connected to another RB450G
sounds like configuration reset…
and safe mode for the future =)
No. Connect serial and enable master port.
But have to drive for this 
(.
yep, sorry, was thinking about RB750 %)