Windows 2019 Server getting Invalid signature with Samba 4.7.11

Christof Schmitt cs at
Tue Jul 14 19:25:53 UTC 2020

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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