Putting CAPI2 logging to good use…


So there was a problem with a  printer which you could connect to via SSL in order to print via IPP.


You go in and configure the printer via a web page like so:



Create New Self-Signed Certificate
Create a new self-signed certificate.  Warning: This operation will overwrite the currently installed certificate with a new self-signed certificate.

Create Certificate Request
Create the Certificate Request that you will give to a Certificate Authority. The Certificate Request will be used to generate a certificate for you.

Import Certificate and Private Key
Import a certificate and private key to use as the Jetdirect certificate. (Note: This will overwrite the current Jetdirect certificate and private key.

Export Certificate
Export the Jetdirect certificate and private key.


The server was configured for  Create New Self-Signed Certificate  However, Vista would fail to connect to the server.  We would connect to and  Vista fails with an error:





 "Windows cannot connect to the printer. Make sure that you have typed the name correctly, and that the printer is connected to network."


BTW - you know you can ctrl+c when those popup boxes are there and capture the info in them right?


So – why did XP work OK but Vista failed..


Let’s start with some CAPI logging… which I discussed back on march 13 , ’07 -- http://blogs.msdn.com/spatdsg/archive/2007/03/13/troubleshooting-pki-problems-on-windows-vista.aspx

The first entry to take note of is this one – spoolsv.exe is the process which is doing a trust verification check


Log Name:      Microsoft-Windows-CAPI2/Operational

Source:        Microsoft-Windows-CAPI2

Date:          8/6/2007 6:40:34 PM

Event ID:      80

Task Category: Verify Trust

Level:         Information

Keywords:      Trust Verification

User:          CRISCO1\administrator

Computer:      VistaCrisco.crisco.com





      <EventAuxInfo ProcessName="spoolsv.exe" />

      <CorrelationAuxInfo TaskId="{D0BD64A0-244A-46F0-8AA0-E80EF5952D61}" SeqNumber="1" />




Then we can clearly see that the certificate is not trusted by the Vista machine we are trying to connect with.




 Log Name:      Microsoft-Windows-CAPI2/Operational

Source:        Microsoft-Windows-CAPI2

Date:          8/6/2007 6:40:35 PM

Event ID:      11

Task Category: Build Chain

Level:         Error

Keywords:      Path Discovery,Path Validation

User:          CRISCO1\administrator

Computer:      VistaCrisco.crisco.com


For more details for this event, please refer to the "Details" section

Event Xml:



      <Certificate fileRef="F5287D67AE6D81E7F7D6C1582BC58DBD7715C870.cer" subjectName="HP Jetdirect 0AF8ACE8" />



        <Certificate fileRef="F5287D67AE6D81E7F7D6C1582BC58DBD7715C870.cer" subjectName="HP Jetdirect 0AF8ACE8" />


      <ExtendedKeyUsage orMatch="true">

        <Usage oid="" name="Server Authentication" />

        <Usage oid="" />

        <Usage oid="2.16.840.1.113730.4.1" />


      <Flags value="0" />

      <ChainEngineInfo context="user" />

      <CertificateChain chainRef="{15DE00A4-2C51-42E0-A086-C85E1B51E30A}">


          <ErrorStatus value="20" CERT_TRUST_IS_UNTRUSTED_ROOT="true" />

          <InfoStatus value="100" CERT_TRUST_HAS_PREFERRED_ISSUER="true" />



          <Certificate fileRef="F5287D67AE6D81E7F7D6C1582BC58DBD7715C870.cer" subjectName="HP Jetdirect 0AF8ACE8" />


            <ErrorStatus value="20" CERT_TRUST_IS_UNTRUSTED_ROOT="true" />




            <Usage oid="" name="Server Authentication" />

            <Usage oid="" name="Client Authentication" />


          <IssuanceUsage any="true" />



      <EventAuxInfo ProcessName="spoolsv.exe" impersonateToken="S-1-5-21-4227054899-3893708993-4289900008-500" />

      <CorrelationAuxInfo TaskId="{0FBD18B4-EFAD-4CFE-B4E8-1DE60B22ED57}" SeqNumber="11" />

      <Result value="800B0109">A certificate chain processed, but terminated in a root certificate which is not trusted by the trust provider.</Result>





There was an option to export the cert from the printer so we do that and import it into the Vista machine trusted root store.

Try again…. Ahh a new error – Ill just paste the relevant section from the CAPI2 logs.





      <UIChoice value="2">WTD_UI_NONE</UIChoice>

      <RevocationCheck value="0" />

      <StateAction value="0">WTD_STATEACTION_IGNORE</StateAction>

      <Flags value="80000000" CPD_USE_NT5_CHAIN_FLAG="true" />

      <CertificateInfo displayName="" />


      <CertificateChain chainRef="{963B980F-686F-4510-B7BA-4E400027465B}" />

      <EventAuxInfo ProcessName="spoolsv.exe" impersonateToken="S-1-5-21-4227054899-3893708993-4289900008-500" />

      <CorrelationAuxInfo TaskId="{4A74C3A9-C2A6-4C10-A05C-5452578D2010}" SeqNumber="6" />

      <Result value="800B010F">The certificate's CN name does not match the passed value.</Result>







Hrmm this one is a little more difficult.


The printer automatically creates a name like:





    O=Hewlett-Packard Co.

    CN=HP Jetdirect 0AF8ACE8



And we don’t like the name? The error is :   The certificate's CN name does not match the passed value.


What does that mean?


It means that the passed value  did not match the CN….


It does a check in crypt32.dll  for  the “server name”  (  ) against the CN  (HP Jetdirect 0AF8ACE8 ) and fails if they are not the same.


We cannot simply connect to  https://HP Jetdirect 0AF8ACE8  as it is not a proper FQDN.



So now we know we can’t get around this and change these check. How to configure this then?


The easiest way to workaround it is to generate a self signed cert which does have the proper names we can connect to.


Per the  printer config page we could submit a request to a CA – but if we don’t have one then the procedure outlined below is the next best option..



Get a copy of makecert.exe ( its in the free download Platform SDK )


·         Run it like so in order to create a self signed cert which has an exportable key and the proper subject.



makecert.exe -r -pe -n "CN=" -b 07/01/2007 -e 07/01/2010 -eku -ss My  printer.cer




·         The switches to make this work are the:

·         pe  switch  ( allow the keys to be exportable )

·         -r self signed

·         -eku specify Server Auth OID


·         You will see a new file called printer.cer


C:\Program Files\Microsoft SDKs\Windows\v6.0\Bin>dir prin*

 Volume in drive C has no label.

 Volume Serial Number is 108D-3591


 Directory of C:\Program Files\Microsoft SDKs\Windows\v6.0\Bin


07/31/2007  10:16 AM               542 printer.cer

               1 File(s)            542 bytes

               0 Dir(s)   3,574,562,816 bytes free



·         Now looking in your personal store  via certmgr.msc you should see a cert in there with the Issued by field as “CN =”

·         Right click on this cert, and export this and include the private keys.

·         Now, go to the printer management web page and import the .PFX file you just exported.

·         Also take the file called printer.cer – and import it to the trusted root store on the Vista machine.


You should now be able to connect OK.



CAPI2 logging is very very helpful – check it out before you jump to conclusions – it may be more helpful than you realize.













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