Hi,
According to [MS-SMB2] 3.2.4.1.1 Signing the Message, it seems that there is no requirement for singing SMB2 LOGOFF Requests. (the specified condition is not met - the request is not a TREE_CONNECT request nor there is a tree connection identified by the TreeId
field)
It seems that when using SMB 3.x - Windows Server expects the LOGOFF request to be signed (when Session.SigningRequired equal to TRUE), if this is indeed the case - the documentation is not clear enough on that. (it is not required when using SMB 2.x, even
when Session.SigningRequired is equal to TRUE)