keep-alive bug

i have configured mikrotik SSTP Section
sstpConfiguration.png
but i have problem
it dont kill sstp loser on user connection lost
mik_eeror2.png
mikrotik.jpg
for example
make sstp connection
open face book
disable your client network adapter.

windows terminiate connection .
but mikrotik dont want to kill user
or kill some body randomly …

any fix?

I have probably this bug too in RouterOS v5.4.
Now upgrade to v5.5. I shall test