break point in mux.sys

[ttan]

Hi all,

I set target machine registry as DEFAULT DWORD 0xFFFFFFFF.
When I bring up the winDbg, there are so many messages print out. I tried
to set a break point in Mux driver such file protocol.c but the break point
never get set in there, it just break and hold the target machine but it
never actually set a break point in the code. How to I do a single step mux
driver I used F10,F11 but it doesn't work.
I also need help on how to set the debuger to print out only mux driver
messages?

Thanks in advance,