Same problem with mac-telnet login from RouterBoard here. Tested: RB2011 with v6.45.1 stable - login via Winbox mac address -> OK; RB2011 with v6.45.1 stable - login via another RB2011 v6.43.14 stable via mac-telnet - ERROR: "Login failed, incorrect username or password"; RB2011 with v6.4...