How i can kill connection?

RouterOS General
1

Hello
2016-02-02_133841.png
How i can kill this connection?
Try many command variants - connection not killed.

Variant with

/ip firewall connection remove [find protocol=udp & dst-address=192.168.250.100 & connection-mark=trifle_conn_to_router

not work too

2

What if you use: && instead of & ?
/ip firewall connection remove [find protocol=udp && dst-address=192.168.250.100 && …

3

When use && instead of & required add :port parameter to dst-address and reply-dst-address arguments.
And not worked too…
2016-02-05_133010.png
How a can kill all unreplied connection by one command?