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WinDev Forum
Beiträge im Thema:
Erster Beitrag:
vor 3 Jahren, 4 Monaten
Letzter Beitrag:
vor 3 Jahren, 3 Monaten
Beteiligte Autoren:
Piet van Zanten, kingdr, Fabrice Harari

WB application Server 19 - images stop displaying over time

Startbeitrag von Piet van Zanten am 31.01.2015 08:54


I have a strange problem that is hard to debug.
My dynamic WB site has dynamic images that show a photo of a member (using filetopage or by programming).
All goes well for a few weeks, but somewhere in time WB stops displaying these images and shows a broken link image.
The images only show when the page is loaded for the first time, otherwise, if the members file is browsed on the same page, the image shows a broken link.
If some button or another action causes the page to be refreshed the image shows up.
All I can do is restart the server and all is well again.

Does anybody have some tips what steps I can take to pinpoint where these problems come from?
AWP sites don't have this problem of course, because the page is refreshed all the time.
As the site is in production the debugging time is very limited.



Hello Piet

based on your description, I'm suspecting that the web server (IIS?) is getting too big for his breaches and doing some kind of cache voodoo that creates the problem...

If I'm right, it will be easy to test: next time you have the problem, instead of restartint the whole server, restart only the web server (IIS?)

If that solves the problem, you'll know WHERE to look for a solution

Best regards

von Fabrice Harari - am 31.01.2015 12:13
Hello Piet

It looks like the firewall issue of both ends and the bandwidth of the internet
connection. Worst that all, if you're using burstable connections and by the
time a large number of people using the same trunk from ISP, then the
slow internet is the cause.

You also need to check the default timeout issue/session in IIS could be the
cause. I'd such problem of uploading a 4GB file (max in IIS by HTTP) to
my app in WB15 and it works after setting a longer timeout limit and the



von kingdr - am 31.01.2015 13:35
Hi Fabrice,

You may be right, because restarting only the WB app server did not help.
When inspecting the generated browser code the image source looks like:

von Piet van Zanten - am 31.01.2015 13:42
Hi King,

Your suggestion seems unlikely, because the problem only occurs on generated images from a database memo.
I don't think a firewall will start behaving differently after a few weeks uptime.
Thanks anyway.


von Piet van Zanten - am 31.01.2015 13:49
Hi Fabrice,

It happened again, unfortunately just restarting the webserver didn't solve the issue.
Any other ideas?

Best regards,

von Piet van Zanten - am 26.02.2015 21:47
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