Application crashing

[JhonSina]

I need help with my application, I use version 1.90.0.1549, it's running on 
windows server 2019 with IIS 10, after a few hours of use it crashes, it only 
works again by restarting the application pool, it doesn't show any error in 
the log, only hangs and stops responding.

 

I was monitoring the system through the unigui monitor, observing, there were 
a couple of sessions, it just freezes and stops responding, and it gets that 
connection loss transparency.

[Farshad Mohajeri]

Hello,

You can also check Windows Events through Event Viewer to see if there any related logs.

[JhonSina]

I didn't find application-related crashes in the events, I don't know how to find out what causes this crash.

[Farshad Mohajeri]

Make sure your IIS pool settings are done as described here:

http://www.unigui.com/doc/online_help/iis_7_0.htm

You can also try using LocalSystem account for Pool Identity to see if it improves things.

http://www.unigui.com/doc/online_help/using-a-different-account-for-.htm

[JhonSina]

Yes, the settings are ok, it's not a iis problem, I think it's something in the application that causes the isapi module to crash during use, before the iss I put it in apache and I had the same problem, I can't identify what it is .

[Tokay]

You can try use the Eurekalog.

[JhonSina]

I did some more tests, realized that the connection loss occurs 
when there is no user interaction, I launched the application, 
opened three sessions, left some forms open and I watched, as 
time goes by, the connection is lost.

 I am using synchronous operations equal to true

[Roberto Nicchi]

On 10/29/2021 at 10:57 PM, JhonSina said:

Yes, the settings are ok, it's not a iis problem, I think it's something in the application that causes the isapi module to crash during use, before the iss I put it in apache and I had the same problem, I can't identify what it is .

You can use a Tunitimer to avoid the session timeout: TUniTimer.DummyEvents Property (unigui.com)

[JhonSina]

I got a north, observing the application for a few days, I noticed that 
it crashes when it comes to destroying the session (session timeout), I 
realized that it only crashes or cannot destroy the session when the user 
has a specific form open , in case it is a budget form, this form I 
include the budget, select the print model and show the pdf on the user's 
screen. 
As it has several budget models, it has several fastraport report components, 
I don't know if that's a problem, but at the moment I haven't been able to find 
out why unigui isn't managing to destroy the session when this form is open with 
a pdf budget open in user screen.

 

Attached is a video showing how the specific form works.

[JhonSina]

Problem solved.

[Abaksoft]

17 minutes ago, JhonSina said:

Problem solved.

Can you please explain How ?

[JhonSina]

Using synchronous operations equal to true, we have to be careful with encoding.

In my application there was a form that was causing the crash.
 
A specific routine that contained the while clause, session monitoring helped me a lot in discovering the form involved.

A code from sr.farshad helped a lot, it gets the main module crash error and adds it to the servermodule log.
the code is attached.

ErrorCode.txt

[Abaksoft]

3 hours ago, JhonSina said:

Using synchronous operations equal to true, we have to be careful with encoding.

In my application there was a form that was causing the crash.
 
A specific routine that contained the while clause, session monitoring helped me a lot in discovering the form involved.

A code from sr.farshad helped a lot, it gets the main module crash error and adds it to the servermodule log.
the code is attached.

ErrorCode.txt 3.46 kB · 5 downloads

Thank you

"It is always preferred to create the web application in asynchronous mode"

From :  http://www.unigui.com/doc/online_help/synch-and-asynch-operations.htm?zoom_highlightsub=asynchronous