We have users reporting that their sessions crash randomly during use, and I believe this has been happening ever since the Windows 11 24H2 update. I haven't seen many other threads or discussions regarding this issue.

Here's what we've tried so far:

Updated ACS client to the latest version
Updated Semeru to the latest version
Updated RVI to the latest version
Disabled and added exclusions for these apps in SentinelOne via hash and file path
Disabled OneDrive
Ran a memory test
Updated Windows (currently on the February 11, 2025-KB5051987 update)
Completely replaced PC

Looking at the dump logs in SentinelOne, it seems like SentinelOne is injecting its modules into almost every application.

We've attempted multiple troubleshooting steps, including completely replacing the workstation, but the sessions still crash.

Here's what the Event Viewer application logs show. There aren't any related hardware or system logs that correlate with this event-only application logs:

Faulting application name: acslaunch_win-64.exe, version: 9.64.7.0, time stamp: 0x6734c166
Faulting module name: ntdll.dll, version: 10.0.26100.2454, time stamp: 0x7cb6b6a8
Exception code: 0xc00000fd
Fault offset: 0x0000000000163df7
Faulting process id: 0x3C48
Faulting application start time: 0x1DB7D696D509026
Faulting application path: C:\Users\Public\IBM\ClientSolutions\Start_Programs\Windows_x86-64\acslaunch_win-64.exe
Faulting module path: C:\WINDOWS\SYSTEM32\ntdll.dll
Report Id: eca110cb-ca19-4ae4-b7b6-17dcac73c1ce
Faulting package full name: 
Faulting package-relative application ID: 

Some have mentioned that the ntdll.dll error is related to memory/stack overflow issues, but I haven't seen any updates or announcements from the affected companies addressing this.

Has anyone else experienced this? Last week, we thought adding SentinelOne exclusions fixed the issue, but this week, the crashes have returned.

------------------------------
Manny Perez
------------------------------

#IBMiAccessClientSolutions

CDHi Manny,

I know that this might be inconvenient - but the best that you can do is "downgrade" (read install again) to Window 11 23H2 - or maybe 24H1. 

The 24H2 version has so many problems with Java based applications, that this might fill a complete discussion of its own.

We had massive problem with iACS, but also with RDi (9.8) and Eclipse. Some other Java based applications seem to run OK, but occasionally stop working.

Right now we're holding all machines on 23H2 until a solution will come up. 

HTH

Daniel

------------------------------
Daniel Gross
#IBMChampion
Senior Core Developer, Geis Group
Pegnitz, Germany
https://blog.qpgmr.de/
------------------------------

Not saying this will work, but..have you tried starting ACS with a defined set of memory for it to run in for its java env. By default, the amount of memory allocated to it is miniscule if you one to have a lot of ACS windows open...This also assumes you have "plenty" of memory installed on your machine. For instance, I have mine starting with 4GB of memory, since doing this, ACS doesn't crash on me like it used to. If you want to try, right click on the main ACS icon and choose properties.  In the target path , add the -Xmx4g syntax to the end like : 
C:\Windows\System32\conhost.exe C:\Users\RMALLOY1\IBM\ClientSolutions\Start_Programs\Windows_x86-64\acslaunch_win-64.exe -Xmx4g
(Depending on the java version you have, that syntax might be a little different.)

Also - even if ACS crashes, you can always generate a set of logs from ACS that you can look at / send to IBM for analysis. Once you reopen ACS, go to the main window like shown below to generate the logs. 


Once its done, you can go to the directory where the dumps were put, you can try to look at what was generated or simply send them to IBM to analyze them. 


Good luck, hope the above helps in some way
Rich

------------------------------
Rich Malloy
Principal Systems Engineer - IBMi
Cox Automotive
Draper UT
------------------------------

For reference, here is a link discussing the above option for starting with 'x' amount of memory for ACS/Java

IBM i ACS Memory Usage

------------------------------
Rich Malloy
Principal Systems Engineer - IBMi
Cox Automotive
Draper UT
------------------------------

Original Message:
Sent: Fri February 14, 2025 12:47 PM
From: Rich Malloy
Subject: i Access Client Solutions Crash

Not saying this will work, but..have you tried starting ACS with a defined set of memory for it to run in for its java env. By default, the amount of memory allocated to it is miniscule if you one to have a lot of ACS windows open...This also assumes you have "plenty" of memory installed on your machine. For instance, I have mine starting with 4GB of memory, since doing this, ACS doesn't crash on me like it used to. If you want to try, right click on the main ACS icon and choose properties.  In the target path , add the -Xmx4g syntax to the end like : 
C:\Windows\System32\conhost.exe C:\Users\RMALLOY1\IBM\ClientSolutions\Start_Programs\Windows_x86-64\acslaunch_win-64.exe -Xmx4g
(Depending on the java version you have, that syntax might be a little different.)

Also - even if ACS crashes, you can always generate a set of logs from ACS that you can look at / send to IBM for analysis. Once you reopen ACS, go to the main window like shown below to generate the logs. 


Once its done, you can go to the directory where the dumps were put, you can try to look at what was generated or simply send them to IBM to analyze them. 


Good luck, hope the above helps in some way
Rich

------------------------------
Rich Malloy
Principal Systems Engineer - IBMi
Cox Automotive
Draper UT
------------------------------

Hi Manny, 

Yes, its a pain that the update caused quite a few things. 

Another person had quite some success (see this link ) RDI Java Problems 

This could help you as well if you would like to give it a go by also using Amazon Coretto instead of Semeru as runtime for ACS?

This SentinelOne is quite concerning that it injects into the actual running system (suppose there are more attack vectors possible than one could imagine). 

I would really though suggest you engage with your CyberSec team to perhaps isolate your ACS / JVM (runtime which ever you use) outside of that as best with extensive exclusions.

Let us know how it goes? 

------------------------------
Marius le Roux, theIBMiGuy
Owner , IBM i Consultant & Technology Strategist, Enterprise Integration Consultant (IBM i Focus)
MLR Consulting
South Africa
------------------------------

FYI, I found a reference to SentinelOne in a Reddit post from 8 months ago: Issues with RDI and Windows 11 (24H2 update)

Entry below:

"Currently the only work-arounds at this time are to either roll back to 23H2 or to whitelist RDI in the SentinelOne config."

I located the RDi.exe file on my PC, copied the path, and sent it to our network administrator. He whitelisted it, and boom. I'm back.

------------------------------
Scott Schollenberger
------------------------------

Original Message:
Sent: Mon February 17, 2025 10:44 AM
From: Marius le Roux
Subject: i Access Client Solutions Crash

Hi Manny, 

Yes, its a pain that the update caused quite a few things. 

Another person had quite some success (see this link ) RDI Java Problems 

This could help you as well if you would like to give it a go by also using Amazon Coretto instead of Semeru as runtime for ACS?

This SentinelOne is quite concerning that it injects into the actual running system (suppose there are more attack vectors possible than one could imagine). 

I would really though suggest you engage with your CyberSec team to perhaps isolate your ACS / JVM (runtime which ever you use) outside of that as best with extensive exclusions.

Let us know how it goes? 

------------------------------
Marius le Roux, theIBMiGuy
Owner , IBM i Consultant & Technology Strategist, Enterprise Integration Consultant (IBM i Focus)
MLR Consulting
South Africa
------------------------------

Scott, 

Might want to recheck that link : 

------------------------------
Marius le Roux theIBMiGuy
Owner , IBM i Modernization and Integration Consultant
MLR Consulting
------------------------------

Original Message:
Sent: Thu October 09, 2025 09:22 AM
From: Scott Schollenberger
Subject: i Access Client Solutions Crash

FYI, I found a reference to SentinelOne in a Reddit post from 8 months ago: Issues with RDI and Windows 11 (24H2 update)

Entry below:

"Currently the only work-arounds at this time are to either roll back to 23H2 or to whitelist RDI in the SentinelOne config."

I located the RDi.exe file on my PC, copied the path, and sent it to our network administrator. He whitelisted it, and boom. I'm back.

------------------------------
Scott Schollenberger
------------------------------


Original Message:
Sent: Mon February 17, 2025 10:44 AM
From: Marius le Roux
Subject: i Access Client Solutions Crash

Hi Manny, 

Yes, its a pain that the update caused quite a few things. 

Another person had quite some success (see this link ) RDI Java Problems 

This could help you as well if you would like to give it a go by also using Amazon Coretto instead of Semeru as runtime for ACS?

This SentinelOne is quite concerning that it injects into the actual running system (suppose there are more attack vectors possible than one could imagine). 

I would really though suggest you engage with your CyberSec team to perhaps isolate your ACS / JVM (runtime which ever you use) outside of that as best with extensive exclusions.

Let us know how it goes? 

------------------------------
Marius le Roux, theIBMiGuy
Owner , IBM i Consultant & Technology Strategist, Enterprise Integration Consultant (IBM i Focus)
MLR Consulting
South Africa

Fix it.  My company's "web defenses" apparently messed it up somehow

------------------------------
Scott Schollenberger
------------------------------

Original Message:
Sent: Thu October 09, 2025 09:28 AM
From: Marius le Roux
Subject: i Access Client Solutions Crash

Scott, 

Might want to recheck that link : 

------------------------------
Marius le Roux theIBMiGuy
Owner , IBM i Modernization and Integration Consultant
MLR Consulting
------------------------------


Original Message:
Sent: Thu October 09, 2025 09:22 AM
From: Scott Schollenberger
Subject: i Access Client Solutions Crash

FYI, I found a reference to SentinelOne in a Reddit post from 8 months ago: Issues with RDI and Windows 11 (24H2 update)

Entry below:

"Currently the only work-arounds at this time are to either roll back to 23H2 or to whitelist RDI in the SentinelOne config."

I located the RDi.exe file on my PC, copied the path, and sent it to our network administrator. He whitelisted it, and boom. I'm back.

------------------------------
Scott Schollenberger


Original Message:
Sent: Mon February 17, 2025 10:44 AM
From: Marius le Roux
Subject: i Access Client Solutions Crash

Hi Manny, 

Yes, its a pain that the update caused quite a few things. 

Another person had quite some success (see this link ) RDI Java Problems 

This could help you as well if you would like to give it a go by also using Amazon Coretto instead of Semeru as runtime for ACS?

This SentinelOne is quite concerning that it injects into the actual running system (suppose there are more attack vectors possible than one could imagine). 

I would really though suggest you engage with your CyberSec team to perhaps isolate your ACS / JVM (runtime which ever you use) outside of that as best with extensive exclusions.

Let us know how it goes? 

------------------------------
Marius le Roux, theIBMiGuy
Owner , IBM i Consultant & Technology Strategist, Enterprise Integration Consultant (IBM i Focus)
MLR Consulting
South Africa

Any resolution for this yet, Manny?

I plan on trying Rich Malloy's suggestion if the issue happens again.  We may have to resort to reimaging the PC with 23H2 if Rich's suggestion does not work.

The user's session is randomally disconnecting once a day.  We got that down to once a week by plugging the users PC directly into the wall jack (bypassing her phone and the consumer switch located at her desk).  It's happening to two of our users so far. 

IBM Client Access Solutions version: 1.1.8.2

Build: 9170 64-bit

Java Version: Java 10.0.2 (64-bit)

------------------------------
Anthony Frantz
------------------------------