Internet Explorer, webdav, and https problems

littlerobbie 2008-06-17 18:39:15 UTC #1

First, some server side software versions:

gentoo linux, 2.6.24-gentoo-r8
apache-2.2.6
mysql-5.0.44
PEAR-PEAR-1.6.2-r1
PEAR-HTTP_WebDAV_Server-1.0.0_rc4
eGroupWare 1.5.010

Now client side versions:

Internet Explorer 6, 7

Now the observations:

Internet Explorer seems to have difficulty downloading attachments from Tracker tickets over https.
IE does not have this problem when accessing the same content over http.
IE does not have this problem if the attachment is an image.
Specifically I see IE fail to download an attachment from the Tracker over https if the attachment is a .doc, .ppt, .zip, .xls (just about anything else).
Safari and Firefox do not have this problem.

When clicking an https link to an attachment using IE, IE opens a new browser window, then a file download dialog over that, then an error dialog over that that says:

"Internet explorer cannot download [filename] from [servername]

Internet Explorer was not able to open this Internet site. The requested site is either unavailable or cannot be found. Please try again later."

I have examined the apache https logs, and I see 200 result codes and correct content lengths in response to the requests from IE as they come in. So the error message displayed by IE is not accurate.

I noticed the webdav.php implementation changed between eGroupWare 1.4 and eGroupWare 1.5. We did not see this problem with eGroupWare 1.4.

Any help is appreciated, as our recent upgrade to 1.5 (wonderful Tracker enhancements!) has introduced this unexpected problem.

Thanks!

Rob

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Ralf_Becker_6 2008-06-17 19:20:46 UTC #2

1.4 used an own download handler, 1.5/6 uses now the general WebDAV
service for all downloads.

I have no idea what’s the problem with IE and https:// …

Ralf

Robert Burcham schrieb:

First, some server side software versions:

gentoo linux, 2.6.24-gentoo-r8
apache-2.2.6
mysql-5.0.44
PEAR-PEAR-1.6.2-r1
PEAR-HTTP_WebDAV_Server-1.0.0_rc4
eGroupWare 1.5.010

Now client side versions:

Internet Explorer 6, 7

Now the observations:

Internet Explorer seems to have difficulty downloading attachments from Tracker tickets over https.

IE does not have this problem when accessing the same content over http.

IE does not have this problem if the attachment is an image.

Specifically I see IE fail to download an attachment from the Tracker over https if the attachment is a .doc, .ppt, .zip, .xls (just about anything else).

Safari and Firefox do not have this problem.

When clicking an https link to an attachment using IE, IE opens a new browser window, then a file download dialog over that, then an error dialog over that that says:

"Internet explorer cannot download [filename] from [servername]

Internet Explorer was not able to open this Internet site. The requested site is either unavailable or cannot be found. Please try again later."

I have examined the apache https logs, and I see 200 result codes and correct content lengths in response to the requests from IE as they come in. So the error message displayed by IE is not accurate.

I noticed the webdav.php implementation changed between eGroupWare 1.4 and eGroupWare 1.5. We did not see this problem with eGroupWare 1.4.

Any help is appreciated, as our recent upgrade to 1.5 (wonderful Tracker enhancements!) has introduced this unexpected problem.

Thanks!

Rob

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–
Ralf Becker
eGroupWare Training & Support ==> http://www.egroupware-support.de
Outdoor Unlimited Training GmbH [www.outdoor-training.de]
Handelsregister HRB Kaiserslautern 3587
Geschäftsführer Birgit und Ralf Becker
Leibnizstr. 17, 67663 Kaiserslautern, Germany
Telefon +49 (0)631 31657-0

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littlerobbie 2008-06-23 18:46:30 UTC #3

Thanks for the reply Ralf. As I am sure you might guess, it is very difficult to troubleshoot this problem as it only happens over https://… Wireshark is no help.

Is there some way to turn up the logging on the egw side to see more of what is going on in the webdav server? In tracing the code I have followed down to the PEAR webdav server handoff. I intend to refocus and go deeper tonight.

Just a thought - because the problem does not occur with content-types of image/*, is it possible the content type is not being set properly for non-image types when handling an https request? Like I said, I cannot tell from the network traffic due to https. But this sounds like just the type of thing IE would choke on while other browsers forgive…

Since the webdav re-design provides a common framework for vfs and attachment handling, it is likely that this problem will affect multiple applications, no? At this time I can confirm it happens in the Tracker and InfoLog.

Also, just as a sanity check, could someone please attempt to duplicate this observation? I don’t want to waste anyone’s time if this is a silly sysadmin mistake, although at this point I don’t think it is…

Many thanks!

Rob

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