resolved DCS does not start anymore

[TheBiggerBass]

Started DCS a few hours ago without isssues. Without any changes or updates since last succesful start of DCS today, DCS suddenly fails to start now with this error message (full dcs.log attached):

2025-11-05 22:52:47.894 ERROR   ASYNCNET (Main): HTTP request dcs:logout failed with error 99: Unrecoverable error in select/poll
2025-11-05 22:52:47.894 ERROR   ASYNCNET (Main): Logout failed: -99
=== Log closed.

DCS launcher starts but DCSstops with the error message above.

How to fix that?

dcs.log

[razo+r]

Have you made any changes to your mods before it stopped working?

Have you already tried removing all mods, run a repair and see if that fixes your issue?

If not, try renaming your saved games folder.

If yes, add one mod after another to see which one causes issues.

[rob10]

Wow, you've got a lot of mods installed and it appears you're getting bunch of errors on them.  I'd start with removing them, if only reduce the clutter in the log.

[TheBiggerBass]

vor 5 Minuten schrieb razo+r:

Have you made any changes to your mods before it stopped working?

Have you already tried removing all mods, run a repair and see if that fixes your issue?

If not, try renaming your saved games folder.

If yes, add one mod after another to see which one causes issues.

vor 6 Minuten schrieb rob10:

Wow, you've got a lot of mods installed and it appears you're getting bunch of errors on them.  I'd start with removing them, if only reduce the clutter in the log.

Well, this morning DCS started as usual. Without applying any other changes it does not start anymore now. I wonder what has changed.

[rob10]

Something got changed in a file somewhere (DCS or even in Windows).  Some part in your computer finally started failing or failed just enough that it can't keep up any longer.  Who knows.  Regardless, with that many mods (or really with any), the most prudent 1st step in troubleshooting is remove them all and do a repair on your DCS.  It's really not worth spending a lot of time troubleshooting until you do that.

Edited Wednesday at 11:47 PM by rob10

[TheBiggerBass]

Ok, starting with a new Saved Games/DCS folder fixed started DCS.

However, I did not change a single file or setting since this morning and DCS does not start anymore. Something external must have changed.

[sleighzy]

Same log error in logs as user who reported game wouldn't start for them earlier today. Removed their mods and worked. Not sure if anything related between these two re: common mods.

 

[silverdevil]

11 hours ago, TheBiggerBass said:

2025-11-05 22:52:47.894 ERROR   ASYNCNET (Main): HTTP request dcs:logout failed with error 99: Unrecoverable error in select/poll
2025-11-05 22:52:47.894 ERROR   ASYNCNET (Main): Logout failed: -99

there is another post commented on by @sleighzy

turns out mods all or in part fixed the issue. the line in your log seems to be a network error.

"error 99: Unrecoverable error in select/poll: This is the core of the problem. "select/poll" are system calls used by applications to monitor multiple file descriptors (including network sockets) for activity. An "unrecoverable error" in this context suggests a fundamental issue with the operating system's ability to manage network connections, potentially indicating a problem with network drivers, firewall configurations, or VPN software."

[TheBiggerBass]

vor 33 Minuten schrieb silverdevil:

there is another post commented on by @sleighzy

turns out mods all or in part fixed the issue. the line in your log seems to be a network error.

"error 99: Unrecoverable error in select/poll: This is the core of the problem. "select/poll" are system calls used by applications to monitor multiple file descriptors (including network sockets) for activity. An "unrecoverable error" in this context suggests a fundamental issue with the operating system's ability to manage network connections, potentially indicating a problem with network drivers, firewall configurations, or VPN software."

Well, although this error seems like the same, I guess the situation is different for me.

1st of all a recreation of Saved Games/DCS from scratch fixed it for me but not for @H60MTI

I don't use any VPNs and my network is working with all other applications without any issues. As a recreation of Saved Games/DCS fixed it the error can't be located within my network setup.

I am just guessing now but it seems there was kind of a file marker created from last login before which had not been deleted after logout. DCS seems to read this file marker as an indicator it is still logged in and therefore logout failed. I don't know if this makes sense but the error message might suggest that.

Atm I am adding the mods back to Saved Games/DCS only as needed but I still wonder why my previous configuration with all mods active did work for weeks without issues.

 

[sleighzy]

5 minutes ago, TheBiggerBass said:

1st of all a recreation of Saved Games/DCS from scratch fixed it for me but not for @H60MTI

Recreating their Saved Games\DCS folder did actually fix it for them  

Yes, there is some auth data there. They were able to identify a specific mod causing issues as they added them back in one by one. 

[TheBiggerBass]

vor 1 Minute schrieb sleighzy:

Recreating their Saved Games\DCS folder did actually fix it for them  

Yes, there is some auth data there. They were able to identify a specific mod causing issues as they added them back in one by one. 

That sounds plausible to me. I'll check which mod could be suspect causing the error.

[sleighzy]

20 minutes ago, TheBiggerBass said:

That sounds plausible to me. I'll check which mod could be suspect causing the error.

Sounds good. They didn’t supply a followup log for the mod with the issue so hard to say if they got the exact same error again. If you find you have an issue when you start adding them back in again drop a note with the one in question and another log. If no issues then yeah may just be something else cached there that I mentioned (or gremlins). 

[TheBiggerBass]

Must be Gremlins. It can't be something else 

[H60MTI]

When I had that issue, it was a mod for me. Once that mod, forgot exactly what mod but it's on that post, was removed from my tech folder, it started working again. Just start with a clean mods folder and start putting them back in until you find the problem file. Can be time consuming but it works.

[sleighzy]

20 hours ago, TheBiggerBass said:

That sounds plausible to me. I'll check which mod could be suspect causing the error.

I just had another look at your log based on @H60MTI saying his was a mod named Wolf in his tech directory of his mods in Saved Games. You also have this same mod Wolf in that directory. Might be the one then. 

[TheBiggerBass]

Many errors in the logfile were generated by mods which I installed several months ago and never caused any issues.

However, I just had a look into the Wolf mod and the entry.lua looks indeed a bit strange. But wolf was also loading fine and available in the game since I installed it several weeks ago. I'll keep it quarantined for now.

Anyway I moved most user mods to a backup directory and only installed a few required ones to Saved Games/DCS. My logfile is much shorter now but still contains error messages, even when loading DCS Core mods. Many of them are value reading errors (like a negative value was read for a parameter only allowing positive values ect.) but seem to not cause any further issues.

[BIGNEWY]

13 minutes ago, TheBiggerBass said:

Many errors in the logfile were generated by mods which I installed several months ago and never caused any issues.

However, I just had a look into the Wolf mod and the entry.lua looks indeed a bit strange. But wolf was also loading fine and available in the game since I installed it several weeks ago. I'll keep it quarantined for now.

Anyway I moved most user mods to a backup directory and only installed a few required ones to Saved Games/DCS. My logfile is much shorter now but still contains error messages, even when loading DCS Core mods. Many of them are value reading errors (like a negative value was read for a parameter only allowing positive values ect.) but seem to not cause any further issues.

Logs will show errors but not all are critical, as long as your dcs is running again its a positive step. 

Feel free to attach a fresh dcs log. 

thanks

[TheBiggerBass]

This is the latest one from today.

dcs.log

[BIGNEWY]

16 minutes ago, TheBiggerBass said:

This is the latest one from today.

dcs.log 171.61 kB · 0 downloads

Thanks a quick look using our log analyser  

Custom Mods
VSN_F104,CH Military Asset Pack Ukraine,A-4E-C,CivilAircraftMod,DCSViperAudioPack,F-15E Sound Mod,F-15E-RWR,VNAO_T45,CH Military Asset Pack Russia,CH Military Asset Pack Iran,Bronco OV-10A,Hercules,Special Mission Aircraft and Operators,CH Military Asset Pack USA,Vietnam Assets Pack,UH-60L Black Hawk,CH Military Asset Pack Sweden,High Digit SAMs,CH Military Asset Pack China,CH Military Asset Pack UK,NATO Ground Forces and units,Mi-28NE Black Shark 3,SAM Sites Asset Pack,OH-6A,F-22A Sounds,Military Aircraft Mod,CH Military Asset Pack Germany

Error
attempt to perform arithmetic on upvalue 'lTime' (a nil value)
Line
55
Script
H:\Saved Games\DCS\Scripts\Hooks\movingmap-hook.lua

Error
unexpected symbol near '['
Line
40
Script
./Mods/aircraft/UH-1H/Views.lua

Error
unexpected symbol near '='
Line
67
Script
./Mods/aircraft/Mi-8MTV2/Views.lua


Tuning Tips
 
Disable civil traffic.,
If you have FPS issues, try turning off VSYNC in graphics settings.,
Remove the OH6GunnerExport script for performance reasons.,
Remove Scripts\Hooks\bhHooks.lua for performance reasons.,
Turn off SSLR.

 

[TheBiggerBass]

Thanks for your immediate support @BIGNEWY

Atm everything works fine and fps is at >80fps but I will disable these mods to check whether they increase system performance.

Edited 13 minutes ago by TheBiggerBass

[BIGNEWY]

10 minutes ago, TheBiggerBass said:

Thanks for your immediate support @BIGNEWY

Atm everything works fine and fps is at >80fps but I will disable these mods to check whether they increase system performance.

No worries and good to hear it is working again. 

I will mark the thread resolved as the initial reason for the post has been solved. 

thank you