[mapguide-users] isapi_MapAgent.dll crashes MapGuideAppPool

[Gunter Becker]

A long time ago I opened that thread and it seems that we now have found the
reason for this application pool crashes! 

The crashes starts 2 years ago when when we start publishing MapGuide
through a ReversProxy. In the beginning just a few users uses the
ReversProxy and that's the reason that the crashes happens quite rarely. But
as the number of users increase the crashes arise more often. The only way
around was to change the settings of the application pool to be more
error-tolerant (allow more errors in a specific time period). As a result
the appliation pool stayed alive but with the side-effect that sometimes
tooltips and selections doesn't work as expected and the Ajax-Viewer often
seems to hang.

The reason for the errors were requests send from the ReverseProxy
(http://localhost/mapguide/mapagent/mapagent.fcgi) to the webserver (IIS7.5)
to keep the connection alive. These request were done as a POST request with
no data. And that causes the application pool to crash. Sending a POST
request with data (any data - whether it make sense or not) results at least
in an error message and leave the application pool staying alive. But
without data it just leeds to a crash.

I think we can say that this is a security issue, causs someone who knows
about this fact can easily terminate the application pool, even without the
use of a ReverseProxy.

I will create a ticket for this!

Gunter



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