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Windows 7 beta and NTLM

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We use NTLM authentication, but the new windows 7 beta (yes, its beta
but its nice to know of potential issues before they get widely
released) seems to be having trouble authenticating.

A standard authentication from XP provides the following in
/var/log/squid/cache.log:

 Got user=[912058] domain=[UK] workstation=[LONW037057] len1=24 len2=24

An authentication from Windows 7 beta is shown below:

  Got user=[009340] domain=[UK] workstation=[LONW032292] len1=24
len2=332
  Login for user [UK]\[009340]@[LONW032292] failed due to [Invalid
parameter]

I see the different "len2" information at the end, so I assume MS has
extended something.

The packages we are running are squid-2.6.STABLE20-1.el5 and
samba-common-3.0.28-1.el5_2.1.

I am curious whether a package upgrade will fix the problem, if this
windows 7 thingy has introduced an incompatibility that we expect MS to
fix with their next release or if this is a valid request that uses a
hitherto unused part of the protocol and therefore we should allow for
it.

Tim Towers
Senior Security Analyst
Global Network Services
CLIFFORD CHANCE LLP 
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