I see...this is a new patch. I'm used little bit older version...
I can see, you can't set the limit to more than 255, but try 0 (zero) - unlimited
In any case, to see, if patch is working, go to event viewer, and expand
Warning key:
...look for Event 4226.
If it doesn't happen AFTER patch installation date/time, it means, the patch is working.
NOTE. Some Windows updates will restore original
tcpip.sys file, so you have to check for Event 4226 after monthly updates. So far, in a period of about two years, I've been using the patch, it happened once to me. You simply reapply the patch, and you're good to go.