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MS Office Forum / Excel / Programming / March 2008

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Work-around for blocking of invalid certificates Excel 2007

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JBeckett - 18 Mar 2008 20:19 GMT
I have received a workbook with macros in it. I trust the sender and the
workbook is signed with a digital signature. However, I receive a security
alert informing me that the macros have been disabled because the signature
is invalid and cannot be trusted because the issue of the certificate cannot
be found. Despite installing the certificate and adding the document to my
trusted folders, I cannot run the macros in this workbook.

Any inpout would be greatly appreciated.
Office_Novice - 18 Mar 2008 20:31 GMT
Check you Macro security setting Tools > Macro > Security

Try setting them to a lesser level.

> I have received a workbook with macros in it. I trust the sender and the
> workbook is signed with a digital signature. However, I receive a security
[quoted text clipped - 4 lines]
>
> Any inpout would be greatly appreciated.
JBeckett - 19 Mar 2008 01:09 GMT
That is of course obvious but it degrades my security significatly when I
only want to be able to get this single workbook to work. I want to be able
to selectively override the mechanism that is blocking the use of an invalid
digital certificate.

> Check you Macro security setting Tools > Macro > Security
>
[quoted text clipped - 8 lines]
> >
> > Any inpout would be greatly appreciated.
Jon Peltier - 19 Mar 2008 04:34 GMT
Do the macros work despite the certificate mess when the security level is
set to medium? You have to approve macros at this level, whereas at high,
you generally will not be asked to approve macros.

- Jon
-------
Jon Peltier, Microsoft Excel MVP
Tutorials and Custom Solutions
Peltier Technical Services, Inc. - http://PeltierTech.com
_______

> That is of course obvious but it degrades my security significatly when I
> only want to be able to get this single workbook to work. I want to be
[quoted text clipped - 20 lines]
>> >
>> > Any inpout would be greatly appreciated.
JBeckett - 20 Mar 2008 19:41 GMT
Hi Jon,

Thanks for the reply. The only way I get this to work is by setting the
Macro Setting of "Enable all macros". I am prevented from approving this
macro with the setting "Disable all macros except digitall signed macros"
enabled. I realize ultimately the problem exists with the certificate but I
could more easily part the Red Sea then get this vendor to correct their
certificate so I was hoping there would be a work around for the blocking of
workbooks with invalid certificates.

-Jason

> Do the macros work despite the certificate mess when the security level is
> set to medium? You have to approve macros at this level, whereas at high,
[quoted text clipped - 31 lines]
> >> >
> >> > Any inpout would be greatly appreciated.
Jim Rech - 20 Mar 2008 20:11 GMT
If you open this file with or without macros enabled and then save it,
doesn't this remove the certificate?  And if it does, can you then go back
to medium security for all files?  A one time hassle every time you get a
new file but...

Signature

Jim

| Hi Jon,
|
[quoted text clipped - 43 lines]
| > >> >
| > >> > Any inpout would be greatly appreciated.
Jon Peltier - 21 Mar 2008 15:22 GMT
Isn't there an in-between setting? (I have no practical experience with
certificates.)

- Jon
-------
Jon Peltier, Microsoft Excel MVP
Tutorials and Custom Solutions
Peltier Technical Services, Inc. - http://PeltierTech.com
_______

> Hi Jon,
>
[quoted text clipped - 49 lines]
>> >> >
>> >> > Any inpout would be greatly appreciated.
 
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