Problem with backslash

Martin Grůza martin at
Wed Feb 26 19:02:09 CET 2020

I’m setting this attribute: NTLM-Group-Required = “DOMAIN\vpnaccess” and in mschap I have: %{NTLM-Group-Required}
(0) mschap: EXPAND --require-membership-of=%{NTLM-Group-Required}
(0) mschap:    --> --require-membership-of=ZSNEMCICKY\\ucitele
Winbindd lookupname failed to resolve ZSNEMCICKY\\ucitele into a SID!

I want only one backslash.

Thank you.

> 26. 2. 2020 v 13:43, Alan DeKok <aland at>:
> On Feb 26, 2020, at 3:32 AM, Martin Grůza <martin at> wrote:
>> I have got problem with backslash when I set it to attribute and expand it to string, there are double backslash, but I want only one backslash.
>  If only there was some kind of debug output which showed what the server was doing...
>  But this isn't a difficult issue.  Double-quoted strings use backslashes for escaping.  i.e. "\n".  This means that backslashes also need to be escaped: "\\"
>  This is how *all* programming languages work, include shell scripts, Perl, Python, Java, C, ...
>  Alan DeKok.
> -
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