Yesterday RB450G lock-up LAN, nobody can't ping the router from LAN,
I can ping and login windox from WAN (but not from LAN).
I reboot it, power off - nothing help.
When I connect it directly to notebook, can login only on MAC address.
When restore old setting (from Files)- not help.
When restore current setting - not help, I can't ping it from notebook.
When I place it back to the working place, turn on and -miracle, it's working.

What is this?

RouterOS v3.27

sounds like wrong settings

sounds like wrong settings

since upgrade to 3.27 it works fine for 2 weeks .