by MSF » Mon, 11 Oct 2004 03:56:50
t's an issue with the DCOM communication interface. I gave the Lexmark
instuctions to another user and it did not help them. Let me know how this
works for you and I will inform the Lexmark driver developers.
I apologize for taking so long to get back to you on this. I have been
working with our development team to try and figure out other methods we
could us to resolve this problem. I think we might have something mentioned
later in the note.
Below is an excerpt from our development staff that was sent to the TAM when
we first noticed the problem:
"Our current printing solution uses a DCOM application
to provide client applications with print path, printer status and
printer configuration. Our current implementation also supports remote
(machine) peer-to-peer printing with printer status.
When we apply Service Pack 2 to a Windows XP machine, peer-to-peer
printing no longer functions correctly. We notice that our DCOM
application (which runs as a service) gets launched, but the remote
client gets an 'access denied' error (5) when it tries to use the
interface. We did some investigation with DCOMCNFG and noticed that we
were able to print when the machine-wide settings were modified as
follows:
DCOMCNFG- > 'Configure my Computer' button -> COM Security -> 'Access
Permissions' Edit Limits -> 'Remote Access' for Everyone=checked.
Prior to the change, the allow and deny settings for Remote Access were
blank, which we understood to mean that the application's settings were
to be used. This leads us to our question: From a DCOM point of view,
what is the exact meaning of the new 'Security Limits' part of DCOMCNFG
and what does it mean if a particular field is blank (that is, neither
Allow or Deny is checked)?
Some background information may be useful. Our component specifies
'Connect' and 'Identify' as it's communication property at runtime with
CoInitializeSecurity(). It specifies launch and access permission via
the Registry under HKCR\AppId\{application guid}."
This gives a basic understanding of why Lexmark uses DCOM and what we try to
do in the Peer to Peer configuration. We basicallly use the DCOM
application for our bidirectional communications and we try to perform the
communications via a Peer to Peer connected printer.
As far as when it broke, we first noticed the problem in RC1 of the service
pack. We started the escalation then, but noticed it was fixed in RC2. By
fixed, we basically mean the defaults for these settings were changed. When
the RTM came out, the default settings for the COM Security were set back to
the way they were in RC1.
We have worked on a method that will allow us to programatically change
these settings, but we would need to prompt the user to let them know we are
trying to make this change and would like to steer away from this if at all
possible. I was waiting to get this out to make sure it was possible for us
to make this change.
--
Alan Morris
Windows Printing Team
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