maximum NTLM_AUTH/Winbind concurrent request

Andrew Bartlett abartlet at
Thu Dec 9 23:17:36 MST 2010

On Fri, 2010-12-10 at 03:49 +0000, Tharanga Abeyseela (RGA) wrote:
> Hi Guys,
> Iam using Samba Version 3.3.8-0.52.el5_5.2, (RPM)  and iam authenticating AD users with ntlm_auth (third party program using ntlm_auth to authenticate users through samba) . but my problem is how many concurrent requests can be handled by the ntlm_auth. I have seen lot of issues on squid proxy server (too many queued ntlm_auth requests and squid failures.)
> Whats the maximum simultaneous connections it can handle ? (is it 256 ? ) how can I increase the limit ? and whats the maximum limit for that ?

On a current version of Samba, you can increase the winbind connection
count, which will increase the number of ntlm_auth processes you can

See 'winbind max clients'.

Andrew Bartlett

Andrew Bartlett                      
Authentication Developer, Samba Team 
Samba Developer, Cisco Inc.
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