[ntlm_auth problem with peap] Some users are authenticated some are not

Hi, I've setup freeradius 1.0.4 for authenticating wireless users. I use peap authentication with ntlm_auth. Setup work fine for most of the users. My ntlm auth command from radiusd.conf is as follows: ntlm_auth = "/usr/local/bin/ntlm_auth --request-nt-key --username=%{mschap:User-Name} --domain=%{mschap:NT-Domain} --challenge=%{mschap:Challenge:-00} --nt-response=%{mschap:NT-Response:-00}" Some user's authentication is rejected with "Logon failure (0xc000006d)" Error. I tried Radius exec--program in command line, it didn't work either. Same message ... Problematic user's active directory authentication works fine for domain. Perhaps it is a bun in ntlm_auth. Any idea?