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Subject [Bug 56971] New: Serving ArcGIS TIF images results in Internal Server Error
Date Thu, 11 Sep 2014 23:46:13 GMT

            Bug ID: 56971
           Summary: Serving ArcGIS TIF images results in Internal Server
           Product: Apache httpd-2
           Version: 2.2.25
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: All

Created attachment 32005
one of many ArcGIS TIFs that result in Internal Server Error

ArcGIS TIF images created by ArcGIS 10.2 results in "Internal Server Error

The server encountered an internal error or misconfiguration and was unable to
complete your request."  

(No error code given in resulting response)

Running apache web server 2.2.25 on Centos 6.4.  Version 2.2.25 is latest
version available via yum on either Centos or RedHat Enterprise.  Our httpd
configuration is essentially standard, except that we force all traffic through
https, using digest authentication to verify users before allowing access
beyond main page.

(Note:  Issue is not "critical" for us;  workaround was to create tarball with
all images, and have collaborators download tarball for viewing in their own
copy of ArcGIS.  However, would be preferable to be able to provide individual
images without collaborators getting "Internal Server Error".  Updating to
"latest" apache httpd is not desirable because we try to keep our Centos system
identical with RHEL systems, and updating RHEL systems with later versions of
software than RedHat supports causes problems with their support team.)

Web server has no problem with TIFs from other sources, or with the same images
written from ArcGIS as PNG format.

Attempt to download file via right-click & Save Link As results in a text file
containing the same error message.

TIFs are apparently not standard TIFs -- they cannot be viewed properly in any
image viewer I have tried (irfanview, Mac Preview, Adobe Photoshop...)  They
either are reported as corrupt or display as garbage.  However, they are
readable by ArcGIS, and display properly in ArcGIS, and the EXIF header
information appears valid.

I believe Esri (providers of ArcGIS) are using the TIFF header format (
0x49492a...) and general TIF framework, but adding some proprietary additional

Underlying problem may be that httpd sees file format as an image format, but
incorrect formatting causes problems.  However, apache should do something a
little less catastrophic than "Internal Server Error" when provided with badly
formatted image data.

Contact with Esri support resulted in: " I spoke with a server analyst and
unfortunately we cannot support this particular issue as you hosting image
files on your own Apache Web Sever.  "

Looking in the logs: (some directory information replaced w/ xxxxx for

ssl_error_log reports:
[Thu Sep 11 18:00:55 2014] [error] [client] Syntax error in type
map, no ':' in
for header ii*, referer:

ssl_access_log reports:
ssl_access_log: - zzzzz [11/Sep/2014:18:00:55 -0500] "GET
HTTP/1.1" 401 468
ssl_access_log: - zzzzz [11/Sep/2014:18:00:55 -0500] "GET
HTTP/1.1" 500 601

ssl_request_log reports:
ssl_request_log:[11/Sep/2014:17:53:35 -0500] TLSv1.2
HTTP/1.1" 601
ssl_request_log:[11/Sep/2014:18:00:55 -0500] TLSv1.2
HTTP/1.1" 468

Am attaching ArcGIS TIF which causes the error.

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