Hi,
> ntlm_auth = "/usr/bin/ntlm_auth --request-nt-key
> --domain=%{mschap:NT-Domain} --username=%{mschap:User-Name}
> --challenge=%{mschap:Challenge:-00}
> --nt-response=%{mschap:NT-Response:-00}"
have you tried something like
--username=\"%{mschap:User-Name}\"
you might be able to escape the characters in this way.
alna