[Samba] Authentication problem

Hello,

os: linux 2.4.30
samba: 3.0.20

I have a problem with authentication of squid users in AD.
For trying to resolve this problem run script:
----------------------cut----------------------
#!/bin/sh
while [ 1 =3D 1 ]; do {
echo '************************************'
/bin/date
/usr/bin/wbinfo -a '<domain>\<user>'%'<password>'
/bin/date
sleep 2
echo
};
done
----------------------cut----------------------

and logging it`s output:

----------------------cut----------------------
....
************************************
Thu Sep 8 16:29:06 MSD 2005
plaintext password authentication succeeded
challenge/response password authentication succeeded
Thu Sep 8 16:29:06 MSD 2005

************************************
Thu Sep 8 16:29:08 MSD 2005
plaintext password authentication succeeded
challenge/response password authentication succeeded
Thu Sep 8 16:30:09 MSD 2005

************************************
Thu Sep 8 16:30:11 MSD 2005
plaintext password authentication succeeded
challenge/response password authentication succeeded
Thu Sep 8 16:30:11 MSD 2005
....
----------------------cut----------------------

at 16:29:08 there is a pause in authentication process.
at 16:32:01 squid dying whith "Too many queued ntlmauthenticator =
requests (251 on 50)"
Observe this error 2-3 times per day.

Thanks for any help.
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