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[Michael Lueck <1574228@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

On Ubuntu 12.04 fully patched, this weekend I attempted to apply the
samba 2:3.6.25-0ubuntu0.12.04.2 updates. That resulted in a Samba NT4
PDC that downlevel Windows clients could no longer log in to. Logging
into said Windows machines with a local account and manually issuing the
NET USE command to bring up drive mounts to the Samba server were
successful.

I have taken log snapshots with Samba logging set to level 3 of a
Windows XP virtual machine attempting to connect to the Samba PDC
server.

>From the working log I see:

  switch message SMBwriteX (pid 4906) conn 0xb82f9978
  api_rpcTNP: rpc command: NETR_LOGONSAMLOGON
  schannel_fetch_session_key_tdb: restored schannel info key SECRETS/SCHANNEL/MDLXP
  schannel_store_session_key_tdb: stored schannel info with key SECRETS/SCHANNEL/MDLXP
  Forcing Primary Group to 'Domain Users' for mdlueck

Whereas in the not working log I see at the same spot:

  switch message SMBwriteX (pid 21144) conn 0xb96f7200
  srv_pipe_check_verification_trailer: failed

Perhaps did Samba make a change that requires something to be specified
in the smb.conf to accept connections from legacy clients?

** Affects: samba (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "Diff of the two log files of the Window XP VM trying to connect"
   https://bugs.launchpad.net/bugs/1574228/+attachment/4645173/+files/SambaPDCWindowsXPClientConnectError.png

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https://bugs.launchpad.net/bugs/1574228

Title:
  Changes to Samba packages for April 12 prevent legacy Windows clients
  from logging in to NT4 style domain

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