[Tickets #9359] unable to view or download S/MIME attachments

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Ticket URL: http://bugs.horde.org/ticket/9359
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  Ticket             | 9359
  Created By         | ges at goldencode.com
  Summary            | unable to view or download S/MIME attachments
  Queue              | IMP
  Version            | 4.3.6
  Type               | Bug
  State              | Unconfirmed
  Priority           | 2. Medium
  Milestone          |
  Patch              |
  Owners             |
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ges at goldencode.com (2010-11-03 14:46) wrote:

I am using IMP 4.3.6 and Horde 3.3.6 with Apache 2.2.14 on Ubuntu  
Server 10.04 (64-bit).

I am unable to view or  download S/MIME attachments.  It doesn't  
matter if the encrypted mail was sent by IMP or by some other mailer.   
View and download of non-encrypted attachments works fine.  I have  
tried accessing the same IMAP account via Thunderbird and for the very  
same S/MIME emails, the attachments can be properly viewed and  
downloaded.

When I try to view or download the file, the browser just shows a  
blank screen.  This is similar to the behavior of ticket 9301, except  
the thumbnail does not show.  In addition, there are no errors in the  
apache log file (in 9301 there was a segmentation fault), nor are  
there any errors in the horde log file.  I tried following the FAQ  
guidance to enable for detailed logging, but no errors are seen as a  
result.  In horde3/conf.php  my debug_level is E_ALL & ~E_DEPRECATED.   
This is the same value as error_reporting in php.ini.  My log priority  
is PEAR_LOG_WARNING, but I have also tried PEAR_LOG_INFO with no  
different results.

In the apache2 access log, I see the GET for the request and the  
status code is 200 but the response byte count is too small for the  
attachment.

Thanks for your help.