Windows 2019 Server getting Invalid signature with Samba 4.7.11

Krishna Harathi krishna.harathi at
Tue Jul 14 19:50:45 UTC 2020

Christof - Thanks for pointing to a potential fix!

Rowland - this issue is faced by one of our customers, so would like to know if/when the issue indeed will be fixed by an upgrade. I had a follow-up question to your suggestion, that Christof already answered.

Thanks to both for taking time and responding so quickly! 

Krishna Harathi

On 7/14/20, 12:26 PM, "Christof Schmitt" <cs at> wrote:

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    On Tue, Jul 14, 2020 at 06:26:36PM +0000, Krishna Harathi via samba-technical wrote:
    > I am continuing to investigate why a client is getting an “invalid signature” error.
    > Sequence of events
    >   *   Smbd generated a STATUS_NETWORK_SESSION_EXPIRED for a read request
    >   *   Client requested for a session (re)setup of the current/existing section (shown below)
    >   *   Smbd responded with STATUS_SUCCESS but response not signed (signature with zeros) (shown below)
    >   *   Windows SMBClient noted the “invalid signature” event (disruptive to client application)
    >   *   Next, there was a new session setup request
    >   *   Followed by smbd response with STATUS_SUCCESS with signature

    From a quick search, this could be
    Samba 4.9.3 and 4.8.7 have the patches for this bugzilla.


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