Sequenced rpc pipes

Jeremy Allison jra at
Mon Oct 31 21:51:01 GMT 2005

On Mon, Oct 31, 2005 at 10:55:56PM +0100, Volker Lendecke wrote:
> Hi!
> When implementing winbind I found that for example LSA is strictly sequenced.
> If you asynchronously send a second request on ncacn_np when there's still one
> unreplied request on the fly, you get a NT_STATUS_PIPE_BUSY on the smbtrans
> command. So I implemented some workaround in winbind around this. After some
> irc chat I think this is the wrong level, this should be handled at the dcerpc
> layer. Attached find some prototype that compiles and survives the normal
> synchronous RPC-LSA test against w2k3. I did not yet test the sequencing, but I
> would like to ask whether I am on the right track.

Yes, I noticed that when re-writing the Samba3 rpc code. There's only
one outstanding request allowed even if the underlying layer could
be asynchronous - you get "PIPE_BUSY" errors. I think the server in
Windows is just synchronous on a pipe.


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