I used the NetBIOS Adaptor Status call to determine the number of free
NCBs (network control blocks) on my system. I then attempted to submit
that many NCBs. However, I began to receive NetBIOS error 9's (out of
NCBs) before I reached the limit returned by the Adaptor Status call.
Why are these errors occurring?
The NETWKSTA.SYS driver needs to keep track of any user NCB that is in
progress. This places an upper limit on the number of NCBs an
application may submit. Currently, this number is based upon the
number of NCBs the driver can support, less the number that the
redirector requires to be a workstation (that is, the LANMAN.INI
[WKSTA] MAXCMDS keyword). However, this is subject to change because
redirector should never allow an application to consume all remaining
NCBs.