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An asp.net website hosted on a windows server 2012 machine, (iis 8.5), randomly omits displaying jpg images.

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Last Modified: 2016-07-15
I get the same results when using a virtual directory as I do when storing the images within physical folders inside the website.  In the development environment using iis express and Visual Studio Pro 2015 it works great.  There are approximately 200K jpg images.  Sometimes when reloading the page, images that did not display the first time, will display, but I am lucky if half the images display.  It seems random because the images that won't display are in the same folders as images that do display and they were all created by the same user account and process, and have nearly the same name.  I have tinkered with output caching and increased most of the size limits such as maximum bandwidth (bytes/sec 4,294,967,295).  I am not an iis expert so perhaps there is a way to debug the problem or check the configuration?
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Dan McFaddenTechnical Lead - Active Directory
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Commented:
Are there any http 4xx errors in IIS's http logs?  I'd expect if there are images failing to load, that there should be indications in the site's http logs.

Dan

Author

Commented:
There are a few lines with:
HTTP/1.1 GET / 404 - NotFound -
Dan McFaddenTechnical Lead - Active Directory
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Commented:
Do these 404's correspond to the missing images when the page is loaded?

Dan

Author

Commented:
They don't seem to.   As I was experimenting with using the virtual directory where the images are generated as opposed to using images that reside within the web site I lost track.  Now the images from the website are displaying fine.  (My bad).  If I use the virtual directory and a mapped drive the image loading is flaky.  I would prefer to use the virtual directory because images are constantly being added and if I have to copy them to the web site, it is unfortunate.

If the access to the mapped drive, (virtual directory), is slow, is there something that can be done to cause IIS to wait longer when retrieving the images?
Technical Lead - Active Directory
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This one is on us!
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Author

Commented:
Thanks Dan, good ideas.

John

Author

Commented:
Thanks Again !
Dan McFaddenTechnical Lead - Active Directory
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Commented:
No problem.

Dan
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